Thank you for your post! If what you mean is a way to categorize the gallery pages of your site or to link other pages in a page then I suggest that you use a link page. Link page will allow you to categorize and link existing page of your site inside it. For more information about the link page, please check out this link - https://support.portfoliobox.net/en/support/solutions/articles/31000148606-link-page
I hope this help! Have a good day!
Arvin (Forum moderator)