I could not find any site where I can ask 3ds Max modelling related questions.
I couldn't find a suitable site either.
However, there was an Area 51 proposal for a 3D Graphics Q&A. It went into Beta but didn't have sufficient statistics to pass off as a successful site.
You are, of course, able to propose this once again, perhaps under a different scope and different name, to get more people interested.
It also seems that Graphic Design has a "3d" tag. That may be a suitable place to ask your question.