How to display a list of customers that did not buy a particular product?

[#1]

i am trying to understand how the Customer Targetting tab works on this example:

http://us-b.demo.qlik.com/QvAJAXZfc/opendoc.htm?document=qvdocs%2FSales%20Management%20and%20Custome...

Click on the Customer Targetting tab , and then select one of the categories in the "Did Not Purchase" section,

I am trying to figure out how the customer list is populated (ie, customers that didnt buy any bikes, or a particular product)

I am quite new to Qlikview, so any help would need to be easy to understand

[10639138]

how do i display Customers who have been Active previously but are not purchasing lately in QLikSense