Dimension Between Circles and Edges on Different Assembly Parts

Hi guys,

I need to create holes in the large bar based off the hole pattern of this case I have. I need those holes to be a certain distance away from the highlighted edges of the bar. I tried doing all manner of dimensioning (including distance mates) and it does not work (it just says something about Annotation view or gives an error).

Another view:

What, if possible, is the correct way to do this? Keep in mind, I must also make extruded cuts into the bar based off the smaller rectangular area in the case later on.

Thanks. Please let me know what other details you need.

SolidworksAssemblies