Ok, the first question is how do I change ownership of a unit? Like for example a command center creates SCVs, what if I wanted to change so that for example barracks made SCVs.
Second question, I know unless you have a

load of time you can't make your own units, but instead edit preexisting. MY question is, what if you want to leave for example the original terran tank, but also put in a custom one. If I edit the original, than it will turn into the new tanks so...that wont work. How can I make it so that there are two choice of tanks one I edited, and the one that is the original given by bw.