abaqus MPC

Hey,

I was working with the user defined MPC constraint in ABAQUS. I am using a script file to apply the constraints. I encounter a problem. I want to use more than two points and give a derivative for eacht of these points (derivative is A). Now I can only add a controlpoint and a set of points as a surface, but all these point in the surface will have the same A value.

With an input file you can just put the points after each other seperated with a , .

My problem is hard to explain. I hope someone can help me