Personally, what I've done is copy the folder named FH2 in C:/Program Files/EA GAMES/Battlefield 2/Mods/ and paste it in the same folder calling it FH XXX, where XXX is anything of your choice. Then, when I want to use that version of the mod, I rename the FH2 folder to FH2 YYY, then rename FH2 XXX to FH2.