Sales Order and WBS transaction

Hi,

I am working on an automatic process for billing, RRB (Resource Related Billings), this process involves billing in T-code DP91 using a Sales Order. The amounts in the SO gets added by uploading costs in the WBS. There is a direct link between the SO and WBS, once the WBS is created it automatically generates the SO and copies all the details from it ( profit center, customer, vendor etc)

Is there a T-code where I can see what is the WBS for each SO or the other way around but in mass, displaying them all together not individual, or maybe a table to see this link?

Thanks a lot