Show related data from portal row

Discussion created by bastian on Oct 4, 2017
Latest reply on Nov 9, 2017 by bastian

I've a portal showing summarized sales figures for different cities (each portal row is another city) by a certain salesman in a certain month. Once I click on a city (portal row) I would like to see only the sales items of this city but I get all items of that certain sales person in that certain time period. What do I have to do to see only the items of one city?