Studio 5-How can I downmix a Quad Surround Mix?

Hey everyone,

I have finally figured out how to mix and listen in Quad surround sound with my Cubase Studio 5.5.3 and Focusrite Saffire Pro 14, but I have yet to discover how to downmix the mix in a 4 channel file. All I can do is downmix 2 stereo files with the Batch function, but that’s not what I want.
I want it to be uncompressed. I mix in 24bit and 96khz.
I see 2 stereo masters in Cubase, after creating 2 stereo outputs 1+2, 3+4 in the connections section.
Can anyone help me?
Thanks in advance.