I read in certain answers and sites that there's a number to put in console commands from at least 10 to 999. If that's really the case, can I repeat that cheat code to like 999 + 999 and so on as much as I want?

Any answers would be appreciated.

If the command is of the form "setX ##" then no, the new value will simply override the old one. I.e if you do "setX 900" followed by "setX 600" the number will be 600 and not 1500.

If it is of the form "addX ##" then yes, the number you input will be added to the pre-existing value.

Wow, thank you.

If you're playing Kotor 2, I recomend Console Commanding yourself a Lightsaber at the Start of the game. Trust me on this.