You may have to use a sub-report to do this. However, try this first:
1. Create a running total for each of the Indirect Hour Types.
- Field to Summarize: the hours field from your data.
- Type of summary: Sum
- Evaluate: Use a formula. The formula must evaluate to true or false and would look something like this: {table.indirect_time_type} = 'Maintenance'
- Reset: If this is going into the report footer, then Never, otherwise reset on the change of the appropriate group.
2. Put these running totals in your report footer.
-Dell