To work with inactive relationships in Power BI, you’ll want to use these DAX functions:

1. USERELATIONSHIP:

   Activates an inactive relationship for the duration of a calculation.

   Example:
   CALCULATE(SUM(Sales[Amount]), USERELATIONSHIP(Sales[Date], Calendar[Date]))

2. CROSSFILTER:

   Controls the direction of a relationship (both active and inactive).

   Example:
   CALCULATE(SUM(Sales[Amount]), CROSSFILTER(Sales[Date], Calendar[Date], BOTH))

3. TREATAS:

   Allows you to create virtual relationships between tables, even without a physical relationship.

   Example:
   CALCULATE(
   SUM(Sales[Amount]), q TREATAS(VALUES(Calendar[Date]), Sales[Date]))

Hope this answers the question!