PO Category bulk update

Hello All,

Is there any API/interface table approach for the below scenario.

We are looking for bulk update the Purchasing Categories on many of our Items. The PO lines contain the Purchasing Category and will not automatically change when the Purchasing Category is updated on the Item.

can some one advise if there is a supported method (API or interface table) to mass update the Purchasing Category on the PO Line for those Open Blanket PO Lines?

Please advise.

Thanks in advance !