How to set a context of the four BUs / Ledger to some Opt-In feature?

We need to activate the following two profile options: 1. Add New Approved Requisitions to Existing Open Purchase Orders (Allows Buyer to add new approved purchase requisition lines to existing open purchase orders instead of creating a separate purchase order for the requisition) 2. Copy Requisition Header Attachments to the Purchase Order Header (When a PR is processed to a PO, automatically the PR header level attachments get attached to the PO) But we require this functionality only for 4 of the Procurement Business Units. Once the profile options are opted in, the feature is getting impacted on all the business units