Text Tutorial:

1. Load patch in FFviewer (PS3 FFviewer if PS3 patch) - (XBOX FFviewer if XBOX Patch)...

2. Go To All Modified GSC's And CTRL+A & CTRL+C

3. Paste into notepad++ then CTRL+S > _rank.gsc
(Rank = Example... "name".gsc is depending on which gsc you copied it out of do this for all gsc's that are modified ).
(REMEMBER: TO SAVE THE NAME THE SAME AS THE GSC).

4. C:/WINDOWS/Progam Files/Activision/Call Of Duty 4/Mods/ModMenu/maps/mp/gametypes/*paste files here*
Program Files = Where you saved the activision folder to. (Mine = program files (x86))
"ModMenu" = Change that to what ever you want... "ModMenu" = Example.

//Pictures
Load your desired patch in FFviewer (in my case its a ps3 patch so i use "BuC-ShoTz"'s FFviewer)
Patch being used - Karoolus
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Pick a GSC to copy (If theres more than one you must do them all in this tutorial i just done '1' for an example)
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Then Press CTRL+A (Select All)
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Then Press CTRL+C(Copy)
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Then Press CTRL+P In Notepad++(Paste)
//dont have to be notepad++ thats just as an example...
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Save The File (CTRL+S) as the same name as the GSC:
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Then save it to your mods folder EG: C:/WINDOWS/Progam Files/Activision/Call Of Duty 4/Mods/ModMenu/maps/mp/gametypes/*paste files here*
Then Your Done:
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//This can also be reversed for pc to ps3 or pc to xbox etc