I don't think there is an automatic tidy all units up switch like MTW, but I hated that switch anyway. I am sure it led me to lose generals sometimes.
Manually, it is the same as before - pre-battle, on the campaign screen, drag one unit onto another. In MTW, it was good to drag the one with fewer upgrades of weapon and armour onto the other. Some have said this is not true in RTW.
One different thing about RTW is that when you retrain, your units are increased to full strength but maintain their experience. You can also retrain 10 at a time. For this reason, I would say it is best not to merge units but wait to get back to town - unless you really don't want to recruit more of that kind of troop.
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