Creating a relationship between multiple tables that share only 2 columns

Hi Anonymous ,

Thanks for reaching out to us with your problem.  I'm not clear about your requirement. Do you want to create the relationships between the table 'Product 1 - test 1' and 'Product 1 - test 2' base on the field [brand] and [sub brand]? If yes, you can create another inactive relationship base on the field [sub brand] after create the relationship base on the field [brand]. You can refer the following links to get it:

Create the inactive relationship:

Inactive relationships 

How to deal with inactive relationship:

Enable Load & Include In Report Refresh in Query Editor - PBI Visuals

radacad.com/userelationship-or-role-playing-dimension-dealing-with-inactive-relationships-in-power-bi

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

How to provide sample data in the Power BI Forum

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