move an object on the x,y plane but staying in the 3D view

 From:  Michael Gibson
11862.2 In reply to 11862.1 
Hi hadri1, you could set the construction plane using View > CPlane. That will control the drawing plane being used in the 3D view.

But I'm not sure that I'm understanding what you are doing though, can you post an example file with the view, point, and curve that you mention in it?

- Michael