How do I measure OBS resources used?

If I have a Left Eye and a Right Eye for 6 different camera angles, with only 4 plugged in at the same time with 3 cameras sharing one USB extension cord, and Using 3 simultaneous cameras only in one shot.

I heard the limit is 6 video sources per scene

is there a way you can "Chunk" a screen into a Left Eye camera layout, a right eye camera layout, a monoscopic game capture and a browser window with Speechchat.com, and would that think of it as a single camera for each eye, a single game capture shared by both eyes, and a Speechchat window shared by both?

What is the differences between a Scene and a Group? Which do I want?
 
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