Remove Controller

I know how to add a controller assignment (e.g.. CC:1 (Channel 1) ), but how do I remove it?
 
Also, each unique controller can be assigned to channel 1, right?
 
Thanks.
 

what i mean is i don't just want to remove the values, but the reference at all to this controller.  when u go to the edit menu, it lists all the controllers.  also the windows below have a screen for each controller.  i only want 2 of the 5 i had added to still be there. it's a pain to cycle through the un-needed ones to get to the ones i want, so i can draw in values for each controller.

hope that makes sense.

thanks.