Thanks for the shout-out @Chris_Hofer . @lindalee certain has more day-to-day experience with maintaining multiple course sites, but nothing should get deleted from the previously-associated courses, though I would personally remove the associations first, anyway. In fact, this is a requirement, because assuming the new associated courses are also the ones associated with the blueprint you want to stop maintaining, it's important to realize that there is only one blueprint a course can be associated with, to begin with, as pointed out here in How do I associate a course with a blueprint course as an admin? :
Once a course is associated with a blueprint course, it cannot be associated with any other blueprint course.
To be absolutely, positively, 100% certain nothing gets overwritten, why not give this a trial run on your Beta or Test server first, just to be sure? There are certain conditions that will trigger overwrites that I mentioned in Tips for Designing and Maintaining Blueprint Courses , depending on how much things were locked down in the original associated courses, but I admit that I never tested out what happens to an associated course if the blueprint changes altogether!
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.