My problem is that i need to change the parent content type of a few of my content types, I know this isn't possible and the fix is to recreate these content types manually/powershell which I am more than comfortable with doing.
Saying that I have had a left field idea which is why i am coming to you guys for a sanity check. The idea I had is to use code to export the content types into an XML file change the required content types and then import again. In my head this will work but then again i am not sure what will happen if i don't change the ID's etc. I am also exporting from 2013 and importing to Online.
Any help will be greatly appreciated, even if it is to say the idea is silly and go back to the other method.