that board doesn't just have RCA outs ..... there are also 1/4" outs. There are inserts for every channel so you can take and channel and send it alone to where you want.
You're gonna need some sorta converter though because USB is digital signals conforming to USB stabdards and no output on that board does that.
So you'll need some sort of interface between the board and you're puter.
I suspect someone will be along shortly with some suggestions ..... I don't record to 'puter so I don't know them.
But I have ( and use) that exact board and I've never used the RCA jacks for anything ......... only 1/4" jacks which there are plenty of to give you all sorts of routing options.
But no, you can not connect any of that boards outs directly to a puter without some sort of interface ..... well, you could use the analog inputs of your soundcard but that usually doesn't work very well.
If you know the secret codes you can get by the mastering boss on level 8.