Hello Ahmad:
I am not sure what you mean by grouping curves. I could think of
two options
1) once all the curves are in, you could add them to a folder (in
the Feature Manager, select the curves, then right click "Add to
New Folder"), which will group them into one location in the
feature manager.
2) or, if you go into File > Open > IGES then click Options,
you get an option (somewhere down the middle) to import curves as a
sketch. That will import all the curves, but group them all into a
single 3d sketch.
Don't know if either helps you to group your curves.
Mike
Hello Ahmad: