Don't have RTW in front of me at the moment. But there's a file called something like

export_descr_units.txt

in your RTW directory. (Possibly under a data or system subdirectory -- it's in a directory with a ton of other text files, most of which do not have the export prefix)

You can directly manipulate unit stats in that file. Just use an ordinary text editor, e.g. whatever default program windows uses for .txt files.