Follow the basic outline of this.

_S UCUS-98645
_G Socom FTB2
_C Code
_L 0x20000000 0x20000000

Now once you have the

_S UCUS-98645
_G Socom FTB2

part you wont need it again unless you start another game. Now when you want to add new codes just use this template

_C Code
_L 0x20000000 0x20000000

Please make sure there are no spaces between lines, it should all look like this.

_S UCUS-98645
_G Socom FTB2
_C Code
_L 0x20000000 0x20000000
_C Code
_L 0x20000000 0x20000000
_C Code
_L 0x20000000 0x20000000
_C Code
_L 0x20000000 0x20000000

Do you get it, try it. If you need help please reply. I have given a sample CHEAT.DB in this post if you need a better baseline.