Ideally, you need a patchbay to save lots of awkward recabling behind. The 8 line outs would go to your input channels, and the mixer has 4 sends (groups) so they can go to the mixer. the snag really is when you are using mics too, you run out of channels, unless you press the stereo ones into action. It's doable but a faff. The patchbay gives you the ability to route things more easily. what you will struggle with is recording all 8 channels at one time - so that would involve some creative bodges.