How to utilize Return1/2 for DAW recording and NOT go to Output?

I can record from USB:

Guitar1 <> Input1
Mic1 <> Input 2
Out3 <> USB 3/4

I’m trying to record the bass from Return 1/2 to a USB 5/6 track, no processing required and must not be audible through Out 1/2/3/4.

I can dedicate a lane:
Return 1/2 <> USB 5/6

But is there anyway to do this without using a dedicated lane?