Purchase order price to sales order

Dear all,

The scenario is in the case of third party sales (i.e trading cases) --- how to get the price of purchase order as the price for sales order and then add margin say 10% to it which would become the gross price and we can add sales tax to it and bill it.

purchase maintains price of goods per unit wise per vendor and they maintain these prices in MM itself.

Can we use EK01 condition type to get this price ? How to use it if we can ?

regards

krishna