3rd level Transform Biotech, can this be used to Change a Personal Upgrade that is a Symbiot? If I use this to change the personal augment I got at level 1 (for example the brain enhancement) when I change skills do I get the original rank that I put into the skill I took. For instance I put a rank into engineering because I took engineering as the additional skill, during the adventure I decide I want to be a computer person and change the skill to computers but have no ranks in computers. does the rank from engineering travel over?
Changing the personal augment: brain to a different skill doesn't make the rank(s) you put in that skill to transfer as well.
It only adds that skill to your associated skill for your connection (and removes the old one).
In your example, you'd lose the connection bonus on engineering, gain it on computers, but the rank you choose to put in engineering when leveling up (or at character creation) does not get moved. That requires a Mnemonic Editor.