[aanker]

Are you able to edit UPC files with a plain text editor like Notepad? Do Not Use Word! or any other formatted text editor, this must be plain text.

I have been using NoteTab to do this for years, the free version has all the functions last I checked. A few years ago I did buy NoteTab Pro ver 6.2 just to support them. Many files can be opened at the same time and you just Tab between them.
http://www.notetab.com/

I'm thinking that the main problem will be the Compartment may be numbered differently between RFB & TMO. So...... do a search for, "Deck Gun Crew" in the UPC file and it should take you toward the bottom of the file, count how many crewmen are part of the "Deck Gun Crew" in both files, then edit the Compartment # and CrewMemberSlot to match the RFB numbers. One member will be the Leader of course. When you can compare the files side by side this will make more sense. Don't add any more crewman to RFB unless you know what you're doing. You don't want a crewman floating in mid air for example.

There may be a short section near the top too (I'm unsure about that.)

Ducimus started with CrewMemberSlot 2 in his example, of course there is a crewman 1, 2, 3, etc:

UserPlayerUnit 1.Compartment 8.CrewMemberSlot 2]
ID=CrewMemberSlot_DGunC1
NameDisplayable= Deck Gun Crew
Type= Crewman
WatchIndex= 0
IDLinkCrewMember= NULL
WatchCrewMemberSlot3D= WM1@slot_M02
BattleStationsCrewMemberSlot3D= WM1@slot_M02
WatchAccessoriesForAdding3DObjects= sapca_ca#Head
WatchAccessoriesForSubtracting3DObjects= sapca_o01, sapca_o02, sapca_o03, sapca_o04, sapca_o05, sapca_o06, sapca_o07, sapca_o08, sapca_o09, sapca_o10, sapca_o11, sapca_o12, sapca_m01, sapca_m02, sapca_m03, sapca_m04, sapca_m05, sapca_m06, sapca_m07, sapca_m08, sapca_m09, sapca_m10, sapca_m11, sapca_m12, nco_o01,nco_o02, nco_o03, nco_o04, nco_o05, nco_o06, nco_o07, nco_o08, nco_o09, nco_o10, nco_o11, nco_o12, sapca_mp01, sapca_mp02, sapca_mp03, sapca_mp04, sapca_mp05, sapca_mp06, sapca_mp07, sapca_mp08, sapca_mp09, sapca_mp10, sapca_mp11, sapca_mp12
BattleAccessoriesForAdding3DObjects= sapca_ca#Head
BattleAccessoriesForSubtracting3DObjects= sapca_o01, sapca_o02, sapca_o03, sapca_o04, sapca_o05, sapca_o06, sapca_o07, sapca_o08, sapca_o09, sapca_o10, sapca_o11, sapca_o12, sapca_m01, sapca_m02, sapca_m03, sapca_m04, sapca_m05, sapca_m06, sapca_m07, sapca_m08, sapca_m09, sapca_m10, sapca_m11, sapca_m12, nco_o01,nco_o02, nco_o03, nco_o04, nco_o05, nco_o06, nco_o07, nco_o08, nco_o09, nco_o10, nco_o11, nco_o12, sapca_mp01, sapca_mp02, sapca_mp03, sapca_mp04, sapca_mp05, sapca_mp06, sapca_mp07, sapca_mp08, sapca_mp09, sapca_mp10, sapca_mp11, sapca_mp12

Just compare the two files side by side and this will make more sense. The
Compartment 8 Compartment may be a different # in TMO. Just keep the RFB #'s as you move down the list. Lastly, remember that there are two deck guns (I think), be sure you copy from the correct gun.

What do you think? Do-able??