Use calculated Dimension in one chart to drive results in another chart

[#1]

I have a chart where I calculate the Top 10 Customers by revenue or profit. In my next chart I need to see the quantity of units sold by product for those Top 10 Customers. How do I do this when Customer is not a dimension in the second chart?

[Gysbert_Wassenaar]

Try something like sum({<Customer={"=rank(sum(Revenue))<=10"}>} UnitsSold). Change the bold names to whatever your field names are called.