In the Operations tab, various set operations for ad hoc-lists can be executed (Union, Intersection, Difference etc.). The result is displayed temporarily in this tab, and you can save it in an ad-hoc list. Always all contacts are stored, regardless of the selection. If necessary, you can remove individual contacts from the result.
By means of set operations, complex target group selections can be realized, for example, "determine all customers in postcode area x that had no sales for more than 6 months in a product line."
Proceed step by step, like in the following examples.