diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index ea6d145641a..2b300b580cd 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -3708,7 +3708,6 @@ class Form
 		}
 	}
 
-
 	// phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
 	/**
 	 *      Load into cache list of payment terms
diff --git a/htdocs/core/class/html.formcategory.class.php b/htdocs/core/class/html.formcategory.class.php
index 1a2c02deb54..707b5d5d0ac 100644
--- a/htdocs/core/class/html.formcategory.class.php
+++ b/htdocs/core/class/html.formcategory.class.php
@@ -60,4 +60,44 @@ class FormCategory extends Form
 
 		return $filter;
 	}
+
+	/**
+	 *    Prints a select form for products categories
+	 *    @param    string	$selected          	Id category pre-selection
+	 *    @param    string	$htmlname          	Name of HTML field
+	 *    @param    int		$showempty         	Add an empty field
+	 *    @return	integer|null
+	 */
+	public function selectProductCategory($selected = 0, $htmlname = 'product_category_id', $showempty = 0)
+	{
+		global $conf;
+
+		$sql = "SELECT cp.fk_categorie as cat_index, cat.label FROM `llx_categorie_product` as cp INNER JOIN llx_categorie as cat ON cat.rowid = cp.fk_categorie GROUP BY cp.fk_categorie;";
+
+		dol_syslog(get_class($this)."::selectProductCategory", LOG_DEBUG);
+		$resql = $this->db->query($sql);
+		if ($resql) {
+			print '<select class="flat" id="select_'.$htmlname.'" name="'.$htmlname.'">';
+			if ($showempty) {
+				print '<option value="0">&nbsp;</option>';
+			}
+
+			$i = 0;
+			$num_rows = $this->db->num_rows($resql);
+			while ($i < $num_rows) {
+				$category = $this->db->fetch_object($resql);
+				if ($selected && $selected == $category->cat_index) {
+					print '<option value="'.$category->cat_index.'" selected>'.$category->label.'</option>';
+				} else {
+					print '<option value="'.$category->cat_index.'">'.$category->label.'</option>';
+				}
+				$i++;
+			}
+			print ('</select>');
+
+			return $num_rows;
+		} else {
+			dol_print_error($this->db);
+		}
+	}
 }