The confusing part is that the engine and the DCT share the same oil, all filled by a single "fill" port. However, there are two separate drains, but the drains aren't "Engine" and "DCT"... actually "oil pan" and "oil tank."
And then there are separate oil filters for the engine and DCT.
The sub-trans is a separate deal altogether, using the same grade of oil as the engine and DCT, but utilizing a completely different set of drain/fill plugs and no filter.
This all took me a while to sort out in my brain.