I have 2 questions related to the same thing:
1) I edited an Upfront Starter theme, customized it and made it my own. I changed all the information about the theme (name, url, version, etc) but it still seems to have a dependency on WPMUDEV. It keeps telling me there is an update for my theme, I want to completely deactivate any link this theme has to WPMUDEV (other than the fact that its an upfront theme of course). I don't want to update it because it is no longer the theme I used as a starting point.
2) What is the proper way to create a new theme and base it on a starter theme? IE: Create a new theme called MyTheme but have it preload all the elements of say Spirit theme as a starting point for creation.