Only Price substitute/price fetch of item X to Item Y at sales order line

Hi All,

We are implementation R12.2.5 where Client have following Business scenario related to Pricing Substitute of Item in current legacy system(QAD).

1. Business pre configured well in advance Item X before Customer Order (customer Item characteristics is similar) and priced as 100 in current legacy system(no configurator)

2. Actual Customer Order came and customer order Item is Y.

3. CSR enter Item Y in Sales Order Line but Price derived from pre-configured Item X i.e. 100 without changing item Y(QAD)

In Oracle to achieve this functionality I tested with Item Relationship (Up Sell) but it change item Y to Item X with Price 100.