The ability to save a "proposed" copy design prior to execution would be extremely useful.
For complex assemblies, setting up a Copy Design can be VERY time consuming. If that Copy Design fails, an error message is generated, but then the user has no choice but to start over again.
If you could set up the copy design, save the proposed changes, & then execute it, that would prevent this issue. If a failure occurred, you could simply could re-open the proposed Copy Design, troubleshoot, & then execute it again. This would be a tremendous time saver.
An alternate solution would be this: upon failure, an error message could be generated, & then the user could be returned to the Copy Design process (rather than get kicked out of it)