Adding alternative unit of measure field in Internal Goods/services link

Hi Experts,

I have a requirement to display an Alternative unit of measure in the Add Internal Goods and services link of ADD ITEM tab in Shopping Cart which comes when user clicks the product id hyperlink of INTERNAL/GOODS AND SERVICES.The Alternative unit should be displayed beside the field Quantity unit .

If anyone has worked on this, Could you kindly help me out on how to proceed further ?

Thanks in advance,

umabalam.