Hello. I'm beginner mapper, and I have before made maps to Counter-Strike Source. Now I have installed Garry's Mod 10 to my computer and I would like to start make maps for it. But I'm bit newbie with Hammer and mapping also. The problem is that I couldn't find option "Garry's Mod" in graphics engine selection. Should I somehow "add" that option? Garry's mod uses orange box engine , right? What option should I choose to make working map for GMOD 10 ?
Big thanks those who would help me with this, sorry about my poor english grammar and my newbieness.