transpose is typically a function for a keyboard, usually not present in a desktop synth. If you want to transpose, you probably can do so using your controller keyboard. but it looks like you just want to change the pitch of osc 1 and osc 2 individually? just use the osc 1 and osc 2 frequency knobs. And yes, the sub is always connected to osc 1.
I advice you to read the manual, since you are asking very basic things, I think you will benifit from learning more about this synth...