How to use Node stack layers in DaVinci Resolve 19 

If you were using node based color management, would you put the input transform on your first layer and output on the last? Would it be messed up if you put both on first layer? I'd imagine if you did, you'd be grading rec709?

Is it possible to breakdown my current node struction in to L1 to L4 or do I have to make this for it's own node stack?

It’s something like sub group?