Have you ever been so fond of a veteran that you felt like taking him from a finished campaign into another campaign? This utility allows exactly that.
Use with caution. You are responsible for all the game errors and balance issues you cause with this. Irresponsible moving of units may make a campaign ridiculously easy and it may be a cause of various problems. If you use this, don't report any bugs or balance issues because it was most likely caused by inappropriate usage of this tool. Merely having it installed should not cause any issues. If you come to some issues with the action of importing and exporting of units, report it to me.
Right click on a unit and select the export unit option to save the unit. Right click on the ground and select the import unit option to add the unit into the campaign. Singleplayer only.