Custom Parts - Managing Price - Inventory

Hello -

I am running into an issue of managing purchased custom parts (that may have QTY breaks & price influx due to material and third party labor increases).

The issue:
When trying to quote an assembly with a purchased custom part, Quote Entry pulls the Material Unit Cost from Standard Cost in Cost Adjustment. This causes an issue because when there is inventory of the custom part, you can not change the cost of the part in standard cost because that will misrepresent the value of the inventory.

I seeking if someone has been confronted with this problem and what solutions are there to mitigate this influx in price and capture it on a quote with the accurate pricing.

A thought:
For certain product class codes, one can pull from supplier base price in purchase advisor, but I do not know if that is feasible.