How to use original game on RCPS3 or how to dump them in order to use with RCPS3

I solve the issue using the usb external drive: i have to create a GAMES folder inside in order to be detected by multiman Now I'm able to copy ame in my external hdd.
Last question: if i copy a disc on my internal hdd and that game has file larger than 4GB, Multiman will split that file, am i right? If so, the dumped game in my internal hdd will not work. What I have to do? Probably i have to copy that game in my external drive, then copy the game on my pc, merge the splitted files and then copy it again in my ps3. Is it correct?

thanks!