You can select multiple categories through the Advanced Search section on the Client List page. Here's how:
1. From the drop-down menu at the top of your Wise Agent page, select "Contacts" then "Contacts List".
2. Locate the Advanced Filters to the left of the Contact List.
3. Select the plus sign next to the "category" filter.
4. Select the desired categories from the drop-down
5. Click Search beneath all the filters at the bottom of the page and you are all set!