I tried the library part feature and found that I can only insert the dimple feature on a planar face. I then tried creating a library part that I can insert and then cut from my main body. I would like to drop the origin of my library part, a sphere, onto a sketch point but imported bodies don't bring all of their properties with them so I can only relate its face to a sketch point. What I'll probably end up doing for this mold is get it shop peened, etched, or machine each dimple by hand with a die grinder. I would prefer a random pattern anyway.

thanks for your input

Joel