IF (
NOT EMPTY ( Sales ),
CALCULATE(
SELECTEDVALUE ( 'Product Category'[Category] ),
CROSSFILTER (
'Product'[ProductSubcategoryKey],
'Product Subcategory'[ProductSubcategoryKey],
BOTH
),
CROSSFILTER (
'Product Subcategory'[ProductCategoryKey],
'Product Category'[ProductCategoryKey],
BOTH
)
)
)