Hi, @PhilvK , here is the hierarchy:
Elevation Types (select a elevation view tag or select the view on the project browser)
Elevation Tags (you cannot load; to set these, go to manage > additional settings > elevation tags)
Elevation Marks (the loadable families you see on your project browser)
So you must create/edit your elevation marks in the family editor, then create/edit elevation tags to assign those elevation mark families and final, assign the elevation tag to a elevation type.
Hope it helps.