Ability to search PO in Manager Order screen by PO header descriptive flexfields

Summary

Our users want to search for PO based on values in descriptive flex fields.

Content

Our users want to search for PO based on values in descriptive flex fields. See the attached screen shot of:

1) PO header DFF

2) Search screen where we want to add DFFs

Any inputs as to how to go about doing it will be very helpful.