Source accounts for allocation from different parents

Summary:

We have an allocation rule that contains source accounts with different parents.

for example: accounts 66122, 66123, 66124, 66125 (parent: 66100) and accounts 54111, 54112 (parent:54110).

How can we define the source section in this allocation rule without creating specific parent for those accounts.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24A

Code Snippet (add any code snippets that support your topic, if applicable):