On Pro and above a biolink can have several pages, e.g. linkspot.bio/u/name/menu.
Adding
Use the page switcher in the top left of the editor → New page, give it a name and slug, start empty or from a template.
Linking
Use /menu as a link URL to point to a sub-page. A "Back" link to the main page is shown automatically.
Managing
Drag to reorder, duplicate or delete from the ⋯ menu. Each sub-page has its own SEO settings.