It would be nice if there was an ability to copy a workout and change it at the same time to put it back in the programming, There have been several times where I wanted to do a similar workout I had but make a few small changes. As far as I can tell you have to make the workouts from scratch or use the exact same one.
Thank you for reaching out with this request. We have spoke about having this ability with the plan again feature. We are hoping to look into this when we update the web.