Without seeing a sample dataset, I've mocked up something using Sample Superstore data.
The question I seek to answer is 'who are the top 10 customers OUT OF those who ordered products in 2015?'
Right click on the Date field and select Create -> Set
Put [Date Selector] on the filter shelf. Select 'In' to show only 2015 dates and 'Out' to show other dates.
Create calculated field [Top 10 Customers]
RANK(SUM([Sales])) <= 10
Add this to the filter shelf and set to True. This is a table calculation and should be computed using 'Table Down'
Hope this helps.
Thank you for your answer! It is certainly another way to create special sets for each chart. Can you please also think of a way to make those sets dynamic? Meaning the user will also want to see the top 10 out of any year or any month?