Hi,
I would suggest that you duplicate the WP Customer Area default menu in WP-admin > Menus and then simply edit it and manually add your category links.
Duplicating is better than simply editing because our default menu is getting automatically synced when you add new add-ons. Some pages may be automatically created, and your custom sub-items might be removed. In case a synchronisation happens, simply add the newly auto-generated items in your customized menu.
Best regards.
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