Connecting a Refrence table

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Hi MaryamSe ,

For one-to-many relationships, table expansion takes place from the "many" to the "one" sides by using semantics. When a matching value from the "many" to the "one" side doesn't exist, a blank virtual row is added to the "one" side table.

You can refer to this learn more:Model relationships in Power BI Desktop - Power BI | Microsoft Learn

Hope it helps!

Best regards,
Community Support Team_ Scott Chang

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