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Ciao manu,
well, the point is that your original idea doesn't need Audacity at all and it's all inside Qtractor, so it should simplify the workflow; especially if you save a multi-bus template project for your future uses.
But if you prefer recording in Audacity anyway, Rui's suggestion works perfectly, and here's how to see Audacity as a device in Qtractor connection manager:
press Pause and Record in Audacity, a new device named PortAudio appears in Qtractor's input ports; manually connect to it any buses you want to send, disconnect "system" and any other unwanted sources, release the pause and start playback in Qtractor.