How do I add and delete units from a nation?

[Edi]

All commands that would require active direction from player (shapechange, makemonster etc) are only useful for commanders. If you GoR a unit with those abilities, then you can use them on the GoRed one. Everything else should work just fine with regular units, though I'm not certain about #onebattlespell. No reason that I can see why it wouldn't work, though.