[-)-MAILMAN-]

Go into the Paintschemes/Regiments folder; you should see a load of files with no file extension, and a corresponding bitmap file for each. Copy and paste one and then open it with Notepad; edit to your liking and then save.

NOTE - make sure it still has no extension (e.g. RAF222 instead of RAF222.txt) or it won't work.

Will this allow you to select these newly created regiments when assigning units in the FMB?

If not how do you add regiments so you can choose them when creating missions in the FMB?