Hi, I will show you an example of filtering sub category from selecting category through parameter.
Follow below steps:
1. Add a parameter with required field.
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2. Add a calculated field to select the values from parameter into a new field.
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3. Now add the created field into filter shelf.
4. Now when a parameter is selected, filter values would change wrt parameter.
See below 2 images for example.
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Hope this helps you.
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