How to link custom properties to purchased cost ?

Hello Everyone,

I am using the Solidworks costing tool. There are several parts are purchased parts and a few of them cost per unit length. I have attached a picture of the custom properties list. One of which contains the total cost of the part, which I would like to link to purchased cost into the main assembly costing tool.

Appreciated your help to solve this puzzle.

Thanks,

Mayur

SolidworksCosting