Onyx Fader controls (Sub master, Over Ride)

Respected Sir,

Fader 1 - Saved ID 1 @ 100% + ID 2 @ 80%. (Sub master, HTP). (This sub master is playing 100%.).

The same time to control the 0% Intensity to the ID 2 through another Fader.

How can make another fader? (Submaster HTP or LTP), (Override)? Or any other option in Onyx (Ver 4.2.1057).

Kindly describe the Steps.

Thank you