How to in Live mode Fade out specified channel

I using ETC GIO/ ION Light console , 

 

My fader wing already pull the submaster to 100% , but i want to in live mode fade out Specified channel , 

 

Example: The submaster included channel 1 thru 20 , intensity already pull to 100% , If in Live mode put command 10 thru 20 @ out will cut out  Specified channel

 

I want to know how to in submaster running channel fade out 10 thru 20 channel , stay channel 1 thru 10 on stage  ... Thanks 

 

[[[[I dont want to the SETUP>DESK>Manual Control>Manual Time to set down time]]]]

Related