Changing the Price/Unit of multiple resources in one shot

We have activities that have resources in multiple offices.  In order to show the remaining hours per activity for the individual offices, we are currently setting the Price/Unit to 1 for the resource we want to show, and 0 for the resources we do not want to show.  This way, we can rename the column for Remaining Labor Cost to Remaing Hours and we can show each resource separately.  The problem is that if I want to switch to the other office, I need to change each resource manually.  I would like to set up a Global Change or something similar to reset each member of a resource tree to be 1 or 0.  Since we don't do cost in the schedule, it won't matter that it will change for every project, because each scheduler will need to run the change before issuing their look-aheads.

Any suggestions on how to run a global change on resource Price/Unit???

 

Thanks!