Tony,

In the past I have just used manual references in the revision block to refer to the grid area. Our practice is to not modify locations of views or dimensions. Should a dimension be relocated and moved to a view or block, we would refer to it as "Delete Dim .153 from C7. Add Dim .155 to B6". Though trying to automate this is a very good idea just to be safe! Admittedly there have been occassions where I worked with a drawing that it was a judgement call whether it was C7 or C6. Generally though it was readily apparent.

Finally, if you find yourself repeating the same dimension over and over, you might want to consider referencing the number of occurences "7X .153" or "7X .153 MARKED 'A' " or "R .153 TYP" depending on the detail you need. Even if at a later date you need to break out one of the occurences and make it unique, it is a better practice to do so then, while using occurences now. Too much detail can clutter a drawing and make it difficult to read well. I've seen parts made wrong from overly detailed drawings as well as drawings lacking all the pertinent dimensions.