I recently write a small article on SQLBI to describe how to create a DAX measure that search for items that have all the items selected in a slicer, instead of any of them. For example, you might want to create a measure that display how many customers bought at least one product for each of the categories selected in a slicer. You cannot change the behavior of the slicer itself, that applies a filter to the calculation, but using DAX you can iterate the selected items and make sure that each one exists in another set of items (such as the products bought by a customer). I think it could be an interesting technique also for different applications (I would be happy to read your ideas in the comments!). You can read the complete article on SQLBI.
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