BI Publisher - Excel Template - Duplicate Tag IDs

Hello, I am designing a BIP template with excel output.  I am having trouble with the tag ID names in the level breaks of the report.  They are aggregated fields and have variable names the same names as the fields they are summing up.  Since I've already added the detail lines of the report to my template I have used the tag ids already and Excel won't allow me to enter duplicates.  Is there a way to define a defined name so it contains the group id?   For instance the tag id I want to use is HoursWork_ID1, it's found