Grand Tactician: The Civil War (1861-1865)

Grand Tactician: The Civil War (1861-1865)

W&L Making my Army one unit
I have 25k troops but only 5k in my Icon. Is there a way to make the 20k in the other two icons follow automatically? Or better yet just put them under one army like in the main campaign?

Ideally I'd like the OOB the same but if I have to put all the commanders directly under me I'd take that.

Manually keeping multiple unit together on the campaign map is a chore, and there's bigger armies than mine still in one unit.