Hi @jennifer zen ,
One of the easiest way is to make it Bi-directional for sales_district and sales_national.
For more detailed information, please refer to official document:
Bi-directional cross filters in Analysis Services tabular models
Learn how bi-directional cross filters in tabular models eliminate the need for hand-crafted DAX workarounds for propagating filter context across table relationships.
Regards,
Zoe
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