Different UoM for Condition Type in Pricing

Hi All

I have query My client does the Sales of Material in different UoM & also charges for Packing with Different UoM.

Is it possible to maintian differnt UoM. For eg If I sale 1 qty for Rs. 100 I want ot charge for Packing Boxes which we will be 2 Qty of Rs. 50 Each i,e the Total Should be Rs.100 + 100 (100 x 2).

During Pricing I get the Price of Box dependent on the Sales Quantiy i.e 1 Pc. Can anyone guide me.

Regards