Summing physical inputs to record on one track? – Cubase

I’ve been using Cubase and Pro-Tools professionally for a long long time now but this one has always stumped me in Cubase. There’s got to be a way that I’m just not seeing.

So lets say I’ve got 3 mics on my guitar cab and I want to sum them going into my DAW. In pro-tools I set up 3 aux tracks with inputs from mic 1, 2, and 3. All 3 aux tracks have an output set to a buss – lets say Buss 1. Then I create an audio track and set the input of that audio track to buss 1 – and my 3 mics get summed into the audio track.

How can I do something similar in Cubase – most days I’m much happier composing and arranging in Cubase so I’m hoping there’s a relatively painless and elegant way to do this. I read about making a group channel but I can’t see how to set the group channel to monitor the different audio inputs or route it to a new audio track for that matter. Your expertise and help is appreciated!