1, With your PrestaShop admin panel go to Catalog > Categories section.
2, Click the Add new category button to create a new category.
3, With the appeared window, fill in the information about the category and save it.
4, A newly created category will appear in the list of available categories.
5, To assign a category to the menu, go to Modules -> Module Manager section. Choose the modules tab. Find Main Menu module and click the Configure button.
6, Click on the “+” button to create a new item.
7, Set the following options. In the Menu, the top link chooses the Selected item option and choose your Available items among the list below it.
8, Click the Save button. Refresh your website. Now, your new category appears in the main menu.