diff --git a/htdocs/ai/admin/custom_prompt.php b/htdocs/ai/admin/custom_prompt.php
new file mode 100644
index 0000000000000..379aa079d40ad
--- /dev/null
+++ b/htdocs/ai/admin/custom_prompt.php
@@ -0,0 +1,232 @@
+<?php
+/* Copyright (C) 2004-2017 Laurent Destailleur  <eldy@users.sourceforge.net>
+ * Copyright (C) 2022 Alice Adminson <aadminson@example.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file    ai/admin/custom_prompt.php
+ * \ingroup ai
+ * \brief   Ai other custom page.
+ */
+
+// Load Dolibarr environment
+require '../../main.inc.php';
+
+global $langs, $user, $conf;
+
+// Libraries
+require_once DOL_DOCUMENT_ROOT."/core/lib/admin.lib.php";
+require_once '../lib/ai.lib.php';
+
+// Parameters
+$action = GETPOST('action', 'aZ09');
+$backtopage = GETPOST('backtopage', 'alpha');
+$modulepart = GETPOST('modulepart', 'aZ09');	// Used by actions_setmoduleoptions.inc.php
+
+$value = GETPOST('value', 'alpha');
+$label = GETPOST('label', 'alpha');
+$scandir = GETPOST('scan_dir', 'alpha');
+$type = 'myobject';
+
+$error = 0;
+$setupnotempty = 0;
+
+// Access control
+if (!$user->admin) {
+	accessforbidden();
+}
+
+
+// Set this to 1 to use the factory to manage constants. Warning, the generated module will be compatible with version v15+ only
+$useFormSetup = 1;
+
+if (!class_exists('FormSetup')) {
+	require_once DOL_DOCUMENT_ROOT.'/core/class/html.formsetup.class.php';
+}
+
+$formSetup = new FormSetup($db);
+
+// Setup conf AI_PROMPT
+$item = $formSetup->newItem('AI_CONFIGURATIONS_PROMPT');
+$item->defaultFieldValue = '';
+
+$setupnotempty =+ count($formSetup->items);
+
+$dirmodels = array_merge(array('/'), (array) $conf->modules_parts['models']);
+
+/*
+ * Actions
+ */
+
+$modulename = GETPOST('module_name');
+$pre_prompt = GETPOST('prePrompt', 'alpha');
+$post_prompt = GETPOST('postPrompt', 'alpha');
+ // get all configs in const AI
+
+ $currentConfigurationsJson = dolibarr_get_const($db, 'AI_CONFIGURATIONS_PROMPT', $conf->entity);
+ $currentConfigurations = json_decode($currentConfigurationsJson, true);
+
+if ($action == 'update' && !GETPOST('cancel')) {
+	$error = 0;
+	if (empty($modulename)) {
+		$error++;
+		setEventMessages($langs->trans('ErrorInputRequired'), null, 'errors');
+	}
+	if (!is_array($currentConfigurations)) {
+		$currentConfigurations = [];
+	}
+
+	if (empty($pre_prompt) && empty($post_prompt)) {
+		if (isset($currentConfigurations[$modulename])) {
+			unset($currentConfigurations[$modulename]);
+		}
+	} else {
+		$currentConfigurations[$modulename] = [
+			'prePrompt' => $pre_prompt,
+			'postPrompt' => $post_prompt,
+		];
+	}
+
+	$newConfigurationsJson = json_encode($currentConfigurations, JSON_UNESCAPED_UNICODE);
+	$result = dolibarr_set_const($db, 'AI_CONFIGURATIONS_PROMPT', $newConfigurationsJson, 'chaine', 0, '', $conf->entity);
+	if (!$error) {
+		if ($result) {
+			header("Location: ".$_SERVER['PHP_SELF']);
+			setEventMessages($langs->trans("CongigurationUpdated"), null, 'mesgs');
+			exit;
+		} else {
+			setEventMessages($langs->trans("ErrorUpdating"), null, 'errors');
+		}
+	}
+}
+
+/*
+ * View
+ */
+
+ $form = new Form($db);
+
+ $help_url = '';
+ $page_name = "AiCustomPrompt";
+
+ llxHeader('', $langs->trans($page_name), $help_url);
+
+ // Subheader
+ $linkback = '<a href="'.($backtopage ? $backtopage : DOL_URL_ROOT.'/admin/modules.php?restore_lastsearch_values=1').'">'.$langs->trans("BackToModuleList").'</a>';
+
+ print load_fiche_titre($langs->trans($page_name), $linkback, 'title_setup');
+
+ // Configuration header
+ $head = aiAdminPrepareHead();
+ print dol_get_fiche_head($head, 'custom', $langs->trans($page_name), -1, "fa-microchip");
+
+if ($action == 'edit') {
+	$out =  '<div id="dragDropAreaTabBar" class="tabBar">';
+	$out .='<form action="'.$_SERVER["PHP_SELF"].'" method="POST">';
+	$out .= '<input type="hidden" name="token" value="'.newToken().'">';
+	$out .= '<input type="hidden" name="action" value="update">';
+	$out .= '<table class="noborder centpercent">';
+	$out .= '<thead>';
+	$out .= '<tr class="liste_titre">';
+	$out .= '<td>'.$langs->trans('Settings').'</td>';
+	$out .= '<td>'.$langs->trans('Value').'</td>';
+	$out .= '</tr>';
+	$out .= '</thead>';
+	$out .= '<tbody>';
+	$out .= '<tr class="oddeven">';
+	$out .= '<td class="col-setup-title">';
+	$out .= '<span id="module" class="spanforparamtooltip">'.$langs->trans("Module").'</span>';
+	$out .= '</td>';
+	$out .= '<td>';
+
+	$sql = "SELECT name FROM llx_const WHERE name LIKE 'MAIN_MODULE_%' AND value = '1'";
+	$resql = $db->query($sql);
+
+	if ($resql) {
+		$out .= '<select name="module_name" id="module_select" class="flat minwidth500">';
+		$out .= '<option></option>';
+		while ($obj = $db->fetch_object($resql)) {
+			$moduleName = str_replace('MAIN_MODULE_', '', $obj->name);
+			$out .= '<option value="' . htmlspecialchars($moduleName) . '">' . htmlspecialchars($moduleName) . '</option>';
+		}
+	} else {
+		$out.= '<option disabled>Erreur :'. $db->lasterror().'</option>';
+	}
+
+	$out .= '</select>';
+	$out .= '</td>';
+	$out .= '</tr>';
+	$out .= '<tr class="oddeven">';
+	$out .= '<td class="col-setup-title">';
+	$out .= '<span id="prePrompt" class="spanforparamtooltip">pre-Prompt</span>';
+	$out .= '</td>';
+	$out .= '<td>';
+	$out .= '<input name="prePrompt" id="prePromptInput"  class="flat minwidth500">';
+	$out .= '</td>';
+	$out .= '</tr>';
+	$out .= '<tr class="oddeven">';
+	$out .= '<td class="col-setup-title">';
+	$out .= '<span id="postPrompt" class="spanforparamtooltip">Post-prompt</span>';
+	$out .= '</td>';
+	$out .= '<td>';
+	$out .= '<input name="postPrompt" id="postPromptInput"  class="flat minwidth500">';
+	$out .= '</td>';
+	$out .= '</tr>';
+	$out .= '</tbody>';
+	$out .= '</table>';
+	$out .= $form->buttonsSaveCancel("Save", 'Cancel');
+
+	$out .= '</form>';
+	$out .= "<script>
+    var configurations =  ".$currentConfigurationsJson.";
+    $(document).ready(function() {
+        $('#module_select').change(function() {
+            var selectedModule = $(this).val();
+            var moduleConfig = configurations[selectedModule];
+    
+            if (moduleConfig) {
+                $('#prePromptInput').val(moduleConfig.prePrompt || '');
+                $('#postPromptInput').val(moduleConfig.postPrompt || '');
+            } else {
+                $('#prePromptInput').val('');
+                $('#postPromptInput').val('');    
+            }
+        });
+    });
+    </script>";
+
+	print $out;
+
+	print '<br>';
+} elseif (!empty($formSetup->items)) {
+	print $formSetup->generateOutput();
+	print '<div class="tabsAction">';
+	print '<a class="butAction" href="'.$_SERVER["PHP_SELF"].'?action=edit&token='.newToken().'">'.$langs->trans("Modify").'</a>';
+	print '</div>';
+} else {
+	print '<br>'.$langs->trans("NothingToSetup");
+}
+
+if (empty($setupnotempty)) {
+	print '<br>'.$langs->trans("NothingToSetup");
+}
+
+
+// Page end
+print dol_get_fiche_end();
+
+llxFooter();
+$db->close();
diff --git a/htdocs/ai/ajax/generate_content.php b/htdocs/ai/ajax/generate_content.php
index c38ab4ef54b99..34d7f1967530d 100644
--- a/htdocs/ai/ajax/generate_content.php
+++ b/htdocs/ai/ajax/generate_content.php
@@ -58,7 +58,7 @@
 
 $instructions = dol_string_nohtmltag($jsonData['instructions'], 1, 'UTF-8');
 
-$generatedContent = $chatGPT->generateContent($instructions);
+$generatedContent = $chatGPT->generateContent($instructions, 'gpt-3.5-turbo', 'MAILING');
 
 if (is_array($generatedContent) && $generatedContent['error']) {
 	print "Error : " . $generatedContent['message'];
diff --git a/htdocs/ai/class/ai.class.php b/htdocs/ai/class/ai.class.php
index dd103c837e001..2771c1b0e0610 100644
--- a/htdocs/ai/class/ai.class.php
+++ b/htdocs/ai/class/ai.class.php
@@ -58,16 +58,35 @@ public function __construct($db)
 	 * Generate response of instructions
 	 * @param   string  $instructions   instruction for generate content
 	 * @param   string  $model          model name (chat,text,image...)
+	 * @param   string  $moduleName     Name of module
 	 * @return   mixed   $response
 	 */
-	public function generateContent($instructions, $model = 'gpt-3.5-turbo')
+	public function generateContent($instructions, $model = 'gpt-3.5-turbo', $moduleName = 'MAILING')
 	{
+		global $conf;
 		try {
+			$configurationsJson = dolibarr_get_const($this->db, 'AI_CONFIGURATIONS_PROMPT', $conf->entity);
+			$configurations = json_decode($configurationsJson, true);
+
+			$prePrompt = '';
+			$postPrompt = '';
+
+			if (isset($configurations[$moduleName])) {
+				if (isset($configurations[$moduleName]['prePrompt'])) {
+					$prePrompt = $configurations[$moduleName]['prePrompt'];
+				}
+
+				if (isset($configurations[$moduleName]['postPrompt'])) {
+					$postPrompt = $configurations[$moduleName]['postPrompt'];
+				}
+			}
+			$fullInstructions = $prePrompt.' '.$instructions.' .'.$postPrompt;
+
 			$ch = curl_init($this->apiEndpoint);
 			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 			curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
 				'messages' => [
-					['role' => 'user', 'content' => $instructions]
+					['role' => 'user', 'content' => $fullInstructions]
 				],
 				'model' => $model
 			]));
diff --git a/htdocs/ai/lib/ai.lib.php b/htdocs/ai/lib/ai.lib.php
index ad5977573087e..d9b0b7858e929 100644
--- a/htdocs/ai/lib/ai.lib.php
+++ b/htdocs/ai/lib/ai.lib.php
@@ -40,6 +40,11 @@ function aiAdminPrepareHead()
 	$head[$h][2] = 'settings';
 	$h++;
 
+	$head[$h][0] = dol_buildpath("/ai/admin/custom_prompt.php", 1);
+	$head[$h][1] = $langs->trans("CustomPrompt");
+	$head[$h][2] = 'custom';
+	$h++;
+
 	/*
 	$head[$h][0] = dol_buildpath("/ai/admin/myobject_extrafields.php", 1);
 	$head[$h][1] = $langs->trans("ExtraFields");
diff --git a/htdocs/langs/en_US/ai.lang b/htdocs/langs/en_US/ai.lang
index 60332e76457e9..6d39073c8e2c6 100644
--- a/htdocs/langs/en_US/ai.lang
+++ b/htdocs/langs/en_US/ai.lang
@@ -1,4 +1,6 @@
 AiDescription=AI (Artificial Intelligence) features
 AiDescriptionLong=Provides AI (Artificial Intelligence) features in different part of the application. Need external AI API. 
 AI_KEY_API_CHATGPT= Key for ChatGPT IA api
-AiSetup=AI module setup
\ No newline at end of file
+AiSetup=AI module setup
+AiCustomPrompt=AI customs prompt
+AI_CONFIGURATIONS_PROMPT=Custom prompt
\ No newline at end of file