UR44 and UR22

I have 2 Steinberg USB audio cards (UR44 and UR22). I would like to use these cards together at the same time. I have to record 8 drum tracks (with Cubase 8 Elements). UR44 can record 6 tracks and the UR22 can record 2 tracks separately.
Can I somehow set the Cubase to record 8 tracks?