Bartendro Dispenser options? coding forward and backwards

Hi,

I'm new at this stuff but very excited about how it works, and i have a Question:)

Is it possible to make the Bartendro Dispenser Go Forward (pouring 4 cl liquid in a glas) and then backwards to take the existing liquid (that is still in the pipes) back to the bottle ??

and how can i program it?

Best regards Michael