I want pick an actual point for the start of a profile. Can this be done with V23?

For instance, I have a profile and wish to start say x-.4 and y-.6 from the profile. How do I get it to start there?

Any help is appreciated.

P.S. I have been one of the complainers before, but V23 really seems to be working quite well for us now. Thank you BobCAD.

David