CREATING RELATIONS WITH DIMENSIONS

I would look at a circular feature pattern

Hi Chris

While in sketch, hold down Ctrl key & select the circles you want to group, In feature Manager Pane (Left) select Equal. Now dim. one circle & you will see all grouped circles will change too.

Hope this will answer your question.

There are few different methods to use:

1. Circular feature pattern as suggested by Jeremy
2. Equal Relations as suggested by Levon
3. Linking Dimensions
4. Using equations

Each has it's own advantages. So you can check all of these and decide the best one to suit your need.