updating item quantities from a xls file

[sirbubbas]

I need a way to update my store inventory item quantities from a warehouse supplied (via emailt)  xls list. Items use UPC for product identifiers. Quantity updates are twice daily. I only need to change the quantity available for sale. I am sure this is being done but I am lacking in coder skills. I have read about downloading eBay in a file and combining this with the xls file.......I will never make it work. Does anyone know of an app or a developer that can help me with this issue?

Thanks

Bubba