Does SAP have any WBS report able to drill downdown detail to PO level

Hi Expert,

Would like to seek for your advise as below:

a) Does SAP have any WBS report able to drill downdown detail to PO level for the assign cost?

What is the T-code?

b) What is the table contain WBS information with related PO level for the assign cost?

Please help.

Regards,

KH