Here I see two different activities you need to do
Existing Records: You can create a flow to update the owner, but this flows has some time limit. So this may fail if you have huge data. So run flow from the views selecting all records in batch.
I suggest using workflows, Console application.
New Records: Instead for triggering a workflow/flow for every creation. create a business rule which will change the owner and make owner field as Readonly.Hope this helps
Hi TravisAs this sounds like an ongoing requirement, you can change the relationship behaviour of the relationship rather than creating a flow to assign records back. - you need to do this in the legacy UI
In the solution, go to the entities>opportunity>n:1Open each of the parental relationships (opportunity_parent_account & opportunity_parent_contact).Change Type of behaviour from "Parental" to "Configurable Cascading" then change Assign to "Cascade None"You may also need to check for other relationships where reassigning cascadesHope this helpsJamie
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