Contacts may be filtered by tags or any custom contact property. To do this select the ‘Add filter’ link in the search form.
Select the contact property you wish to filter by from within the modal that pops up.
There are three different filter options for custom property filters:
i) filter contacts by if the selected contact property value is known
ii) filter contacts by if the selected contact property value is unknown
iii) filter contacts that match the inputted value for the selected contact property
Select your option and click the green ‘Add’ button.
You will the see the filter listed at the bottom of the search form. Apply any other filters you wish and then select the blue ‘Apply’ button.