How to create relations between construction geometry in two different sketches?

Hi I'm learning Solid Works. I'm not sure how to creation relationships between geometries in two different sketches. I noticed that when I'm working in one sketch I can just hold down shift, click another element, and then define relations. But when I need a relation between two elements on two different sketches (same part), I'm not sure how to do that.

Any help is appreciated

Rick

SolidworksParts And Features