Adding a squad with multiple members

[ChainsawXIV]

This came up for me, as well as for another guy working on adding some characters to the WH data files, and I can't figure out if or how it can be done. Any help would be appreciated.

What I'm looking to do is add a unit that comes out as a squad with another unit as a second squad member automatically. For example, Vlad VanCarstien and Isabela VanCarstien, both independent characters, are always taken as a couple. I could add one as an automatic option of the other, but it would work better if they just came pre-grouped under the Vlad and Isabela squad. Is there a way to do this?