Tanya,
Yuk! Work Types do not hold the Indirect Percentage factors, just Resource. I would suggest 2 things:
1. Talk to Cost Control - Job Manager as they might have made this new functionality in the APP
2. Write an extension to accomplish this but it is not a small task. I can see the Work Type holding an Overhead Percentage to be based on hours, lets say, and that this percentage will be booked when Job Journal/Time is posted on the Work Type for the Overhead and its related GL Account on the Resource GPPG.
Hope this helps.
Thanks,
Steve