Pat,
Are you using blocks within the RefNote Manager, Plant Manager, or Irrigation Manager? If so, you should be able to select the given item from the Manager and click the Highlight button to find where all are located in the plan.
If you are just trying to find given generic blocks through the plan, and you know the block name, you could probably find their locations with the QSELECT command, or the "Find non purgeable items" within the PURGE command.
Either way, if you could expand on what your are after we might be able to point you in a better direction.
Cheers,