Sketch relations

Hi,

I want to lock two sketches together so when I extrude either one the other one travels with it. I need to extrude in two dimensions and I want the two sketches to stay together in the middle while the extrusion lengths can vary in either dimension. I get an over-defined sketch when I try to do this. So specifically in the model I want to extrude the Ambient Medium but keep the Dura Cut sketch locked to the Ambient medium so I can then extrude the Dura Cut the same dimension up and down.

Can anyone see how to achieve this?

I'm using SW Student Edition 2010-2011 so if you modify & save can you save so I can open it.

Thanks,

Kris

SolidworksSketching