BuddyPress.org

With difficulty. I would suggest best approach is to create a new field group add a series of text fields the user ‘could’ use, ensure they are optional, user fills in what they wish and you only display those fields that return a value i.e have been completed. note: a new field group will only be editable from the user profile and would not appear on sign up page by default, if required on sign up page then add new fields to the base group.