The last part of your question: How to link specific sites/units at the supplier with specific sites/units/users at your company is by far the hardest to pull off. Actually, it would be almost impossible to do between two large global companies. And if somehow you got it done, it couldn't cost-effectively be kept up to date. I recently helped a global oil & gas firm deploy a supplier evaluation system. The rationale for not attempting the user to user linkage was that that the evaluations are supposed to be objective and consumable by anyone in the business. Once completed, it is a Global Parent Evaluation not the Singapore Office's evaluation. That was our objective from the start so we accepted the limitations of the available solutions. Happy to discuss further. I can be reached at +1 646-705-3720.