Problem of BOM and Costed Bill of Material Inquiry

Hi,
If I have a manufactured product A made from other manufactured components B and C. And component B is made from D and E.
In Costed Bill of Material Inquiry, the cost for B is correct but in the Costed Bill of Material Inquiry for A it does not take the cost from B.
We did not enter the selling price of B because B is not for sale but B has cost. A's costed bill of material should know the cost of B and add the cost to its costed bill of material.

Please advise