OpenGL interface

Im creating a windows based application using OpenGL. I need to develop a 3D integration tool where the user of the software will be able to integrate 3D objects from other sources and perform transformation to the objects using my tool. My problem is,how to develop the interface of this tool? Is there anybody can help me?

You haven’t given enough information to completely answer your question, but if the objects you’re importing are in VRML, then you might find some good example code here:
VRML viewer using OpenGL