Hi Lyle,
Here's what you need to do:
1) Create a SQL Query that looks something like this:
Select Address From Table
Where Task = 'Pot Hole Filling'
2) Go ahead and add this as a Command Object to the report (Database Expert > Expand Connection Name > Add Command > Type in the SQL)
3) DO NOT link this Command table with the other tables on the report. You can ignore the warning CR generates
4) Create a new 'Dynamic Prompt pointing to the 'Address' field from the Command SQL.
This will always show addresses limited to that particular task. If you also need the 'Task' prompt, you would need to add the Task field to the SQL query's Select clause and create a Dynamic Cascading Prompt using the two fields.
Hope this helps,
-Abhilash