Item costs are not transferred to BOM

Hello,
I have set up a few items with their respective costs. I am now trying to create a BOM with these items and would like to have the items that I add to the BOM with their respective rates. Why is this not transferred directly/automatically? I dont see the sense in creating items with their respective rates and add these rates again when creating a BOM.
Thank you.

Select pricing based on “Price List Rate”