Category or Local Descriptors, Copy to Requisition Line DFF

Hello, we are on R12.1.3 version

we have requirement to create two custom columns/descriptors for BPA upload for goods items. So I know that we can create local descriptors and am able to see these and upload successful via Tab Limited file on BPA.

Now when I was verifying to see these two columns on Requisition lines. I would like to know if there is process or documentation which would help us copy these two custom columns to Requisition line DFF attributes.

Are we having any extensions? or do we need to do customization to achieve this.

Thanks in Advance...