Subnets we are not using

Hi amoshier 

Maybe you can try Except() function:

Here is a sample:

Then i add a new table:

Table 2 =
EXCEPT (
    SELECTCOLUMNS ( 'Table', "Owned", 'Table'[AA] ),
    SELECTCOLUMNS ( 'Table (2)', "All", 'Table (2)'[BB] )
)

This dax can remove duplicate values from the second table and the first table, so the result is as follow:

Here is the link for your reference:

EXCEPT function (DAX) - DAX | Microsoft Learn

If the above one can't help you, could you please provide more raw data in your tables (exclude sensitive data) with Text format and your expected result with backend logic and special examples? It would be helpful to find out the solution. You can refer the following links to share the required info:

How to provide sample data in the Power BI Forum

How to Get Your Question Answered Quickly

And It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards

Zhengdong Xu
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