need to receive input from just 2 channels of a 6 channel audio interface - does OBS support this?

[squallog]

I'm using a Zoom F6 audio interface to receive 6 audio inputs (3 stereo pairs). These inputs all need to go to different places, I only want 1 stereo pair going into OBS. When I select the device within OBS there doesn't appear to be a way to select which inout channels are being used, other software looking for audio inputs recognises that there are 6 different options available
I have the most recent drivers installed from the Zoom
Am I missing a setup step within OBS, or do I need to find a workaround?

Thanks