I use Photoshop / ACR a lot and I'm well used to they way they handle conversion from black and white. I have control over reds, greens, blues, yellows, cyan and magentas, which allows a huge flexibility in conversion.

I'm trying to transfer this knowledge to Resolve, but I'm struggling to find a comparable workflow. The Saturation setting in the Primary settings doesn't give any such control, so I'm assuming I need to break the footage in it's RGB components and work on each separately, however I can't find a way to split and recombine them so that I end up with a monochrome image.

I can find almost nothing relating to grading colour footage to black and white in resolve, so what is the most flexible approach?