Recording live captured channels to a empty sub

What is the correct syntex for recording live captured channels to a empty sub.  Im working in live with multiple channels up. I have about 30 channels captured that I want to record into a sub without having to do it manually.  i vaguely remember how to do this. I have select my captured channels and make them manual which is in a soft key and then i go blank... something with record group sub... can anyone help me with this thanks. 

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