I was just wondering what the "Sub" column in the Cost Report refers to?

Thanks,

We treated it as sub components for assemblies. And that is how we broke up the operations (machining, drilling, prep) in our routers,

example
Intake Assembly
A-Restictor
op1-cut blank to length
op2-center drill
op3-drill 1/4" through pilot hole
B-Plenum Cone
op1-cut blank to length

so on, and so on, and so on, until you give up.