Somewhere around AD14-16 they introduced variants with alternate footprints. So you don't have to put two dummy components in parallel, and there are some exceptions built in to the two footprints, they can overlap.
Go to variant dialog, add a new variant if applicable, and select an alternate component. You need the full component (footprint and params, including supplier link if you're using it) in a library already. Or you can edit the params manually, but the footprint field still has to pull from a SchLib it seems.
Tim