How to add a column into assign source of supply

Hi Gurus,

Can you please provide a document or steps to add a column into the assign source of supply in SOCO.  We have a requirement to show the vendor currency in the assign source of supply screen.  We know this data exists when you click on the supplier name and look at the data.  We want to show the currency for the vendor based on the PU Org in the SC.

Thanks,

Jeff