Questions urgently waiting for answer about ABAQUS SUBROUTINE

DEAR ALL,

Briefly, my project is about to move rolls in three DOFs and coressponding to two different coordinate systems, IN THE SAME TIME. (not to mention other requirements...)

I have been really struggling with starting leanring abaqus subroutine, there are some of my questions and major concerns about the project that I am going to do using subroutine:

1. I am using analytical rigid body modelling toolings, is this going to be a problem in terms of the usage of DISP and MPC (the reference point of rigid body seems dont have any ID number)? [or let me put in this way: I was wondering, if anyone ever used USER SUBROUTINE targeted on ANALYTICAL RIGID BODY? If yes, could you please share a bit with us?]

2. Can I assign for example a DISP subroutine to the CAE file, and in the menawhile, assign another BC in the CAE interface?? or if I choose using subroutine for sovling BC problem, then I have to stick with subroutine, none CAE BC setup should be assigned?

Anyone attempting to answer the questions will greatly appreciated.

 Jason