Simulate BPMN diagrams

I want to create a a main process in BPM开发者_C百科N(High level BPMN) that has several sub process and I want to hide them from the modeler,that is I will provide only the main process for the modeler. For ex.In a customer registration process I will provide the him only to see an icon called "Customer Registration". Underlying processes will not be visible to him. I'm going to use existing BPMN for this process and will develop an addin for visio.Will that be possible?How can I do this? Is there any way to simulate a BPMN digram that is drawn in visio other that Rockwell Arena?

Thank you. Regards, Nilani.

All this has been taken care by Oryx. You no need to reinvent.

http://bpt.hpi.uni-potsdam.de/Oryx/BPMN