I think MikeG 's answer is probably what you're after. But if you are trying to pull the same default intersections across 2 cubes in the one QuickView you can always do overrides (or 'mashups' as we call them).
For example, if you have account on the row, you can build your member filter as such:
A#YourAccount:Name(MAINREP),
A#YourAccount:Cb#RETLWRK:Name(RETLWRK)
Obviously, this only works if all of the other intersections utilize the same dimensionality. If you have different dimensionality you can continue to do more mashups by adding ':U1#YourMember' (or any other dimension) as needed so that it properly retrieves data.