Purchase Order Consolidation for Outside Operations

I understand that there is 'new' functionality in 9.0 that will allow me to 'consolidate' my Purchase Orders to a vendor for outside operations in work orders, and I've looked over the documentation for how to set this up, but I'm not sure what this functionality (and therefore if I'm setting things up correctly) does or is supposed to look like.. I understand that this will create a single PO with multiple line items (one for each work order outside operation).

Does it only 'consolidate' POs created work orders created from a single MRP 'run', or does it add new outside operations PO line items to any existing PO for that vendor.