QUERY RELATED TO ST/OT ORDERS

Dear All ,

I have a question related to inter company orders where we use ST/OT process.

we want to process ST with one item code and OT with another item codes.

meaning , we have 2 items codes in the system for one item.

these 2 item codes are available under different branch plants.(different company)

while creating ST we want to use let's say item code 1001 but while creating OT it should be auto created as 1100.

is there any way we can use cross reference or something to accommodate this requirement.

Thank You