In the editor just right click a unit, under the properties menu you can set it using the level drop down menu. If you are making a campaign you need a trigger to remember your units stats when the first map ends.
example:
event: when all main objectives compleded
conditions: (dont think you need anything here for this to work)
actions: save unit xp Victory
Message edited by Grandslam - Thursday, 2009-04-02, 7:24 PM