planning parameter of an order release directly attached to an existing shipment

Summary:

Is there a setting in OTM that would allow us to schedule a release order and link it directly to an existing shipment that still has space?

Currently, to perform this type of operation, we schedule a release order, which creates a new shipment, and then merge it with the original shipment.

Content (please ensure you mask any confidential information):

Example:

We plan OR1, which has a total of 15 CUMTRs. OTM creates shipment SH1.
We receive a new OR2, which has a total of 10 CUMTRs.
The question is, is it currently possible in OTM to launch a schedule for OR2 and automatically attach this OR to shipment SH1?