button of trim to make an impulse

Hello, I do not arrive has to schedule(program) a button of trim to make an impulse.
Trim L + / impulse +
Trim L - / impulse-

thank you

I successful air has to give a boost on ch9 with the trim L +.
When I makes a blow of trim L + my ch9 horsemanship has bottom and refocuses.
I would also want towards trim - .
thank you