CTO in Requisition

Content

Hi ,
We need to use CTO item or KIT items in Requisitions.
Requirement is that Parent Item price will be calculated from Child Items. For Example:

1) Parent Item consists of 2 CHild Items
2) Child Item 1 Price is 10 $
3) Child Item 2 Price is 5$.

When user search for Parent Item than Price should be based on Child items that is 15$.

I created CTO BPA . But I am not able to find any item associated in this BPA.
As per Document , it seems possible:
https://docs.oracle.com/en/cloud/saas/procurement/20a/oaprc/manage-purchase-orders.html#OAPRC1941140

Attaching Screenshots.

I am not sure what mistake I am doing.