How to? Crop/Mask one video layer over the other?

I'm working on a personal project and doing some finishing myself instead of handing it to the folks who know what they're doing.
I have a shot that needs a split screen but with a shaped matte. I could colour/render both clips and then put them together in Premiere/AfterFX but I know I'll have more control in Resolve.
The shot needs a shaped window so the square crop tool in Resolve won't work. I've looked through the crop section of the manual in chapter 29 but can't find the solution. How would the Master Jedi's here solve this problem?
Thanks in advance,
I have a shot that needs a split screen but with a shaped matte. I could colour/render both clips and then put them together in Premiere/AfterFX but I know I'll have more control in Resolve.
The shot needs a shaped window so the square crop tool in Resolve won't work. I've looked through the crop section of the manual in chapter 29 but can't find the solution. How would the Master Jedi's here solve this problem?
Thanks in advance,