How to Assign Item Master Organization to the Sourcing Rule

Summary:

We would like to create a generic Sourcing Rule and assign Item Master Organization to an Sourcing Rule

Content (please ensure you mask any confidential information):

We have business requirement to create a generic Sourcing Rule which would be invoked when the Item-Org Sourcing Rules is not found to ensure seamless Order Entry Process. However, I can see all the Inventory Organization except the Item Organization (Item Master).

Can anyone suggest how to create a Sourcing rule which can be used to source from Master Org or any alternative to create an Sourcing rule which can act as a placeholder for all the Items. This will be used when Item is coming from MDM to be created in Oracle and we will create a default sourcing assignment/sourcing rules for all such new items.