How do I add and delete units from a nation?

[Edratman]

As far I know, non-commander units do not have magic.

When making the unit you can place the #onebattlespell command, but it should have no effect. When you GOR the unit, it may come into play.

One thing that will work (sort of) is to make the unit a recruitable unit and then make a spell to summon it as a commander. Or the reverse if you want.