I wish I could help you, I am looking for the same information. I think outside of deleting the previously calibrated loads, we might be stuck. I haven't tried it since I like to have the entire season on my monitor.
I think it depends on what you change to yes. let me do some checking the next couple of days and get back. If you only answer yes to delete cal then those loads will be deleted. Not sure if you can un mark them as cal or not. Will also be checking on that as well. I would think you would not want to do any deleting until finished for the season and have your information.