Workaround for creating a top list for columns
The pareto list is only possible to limit the number of rows to top n. If you want to limit the members in the columns, you need to use some caluclations as a workaround.
See the following example for a Top 2 list:
Step 1: Create crosstable
Step 2: Mark Top 2 Salesperson with 1
Step 3: Hide/Show Salesperson members with the help of the caluclations #1 and #2
Step 4: change object type (or hide calculations via visibility)