NEED HELP exporting multiple outputs

I have a project with multiple stereo buses as outputs. The kick and snare have their own buses labeled “Drums” and my sub basses are routed to a bus labeled “Subs”. I have everything else on the default “stereo out” bus. The issue is that I have the main output volume for the stereo out bus lowered so the drums and subs are more prominent in the overall mix. My problem is that there doesn’t seem to be a way for me to export each bus (Stereo out + Drums + Subs) into one final mix. Is there any way I can do/get around around that?

which version of cubase are you using? and what platform?

Cubase artist 7.5