I can certainly do a little bit of research and come back to you with an answer on that.
I know there's a way to do a joint committee meeting. You could also simply attend each other's meetings. Any member of Parliament has the right to attend meetings. It depends on how official.... You can also pass motions to allow the evidence and documents given from one committee to be used in another committee's report.
Those are a few avenues, but I can certainly undertake to do more research.