sell and purcahse of kit and individual items

Dear All,

Our client purchases the Kit(which consists of 7 component) and sell it as individual component or as kit (consists of 5 component or 4 component.)

For above scenario i am using templet BOM but it is not showing exact cost price while selling kit or individual component.(while purcahsing i am taking parent price and while selling i am taking parent item price)

Can anybody give me solution how it works in sap b1

Regards,

Vivek