Well i think you do!
1. Export it from the map with MPQ MASTER
2. Open it
3. Edit it how you want but remember to keep the template like don't add extra rows(you can try but it might give errors)
4. Save it
5. Import it via IMPORT FILES in the editor.
6. You're done!
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.