Reply lets you add custom fields to your contacts. For example, you have added the Gender custom field, and decided to filter all male contacts in order to move them to a specific sequence. To do this:
Open the People page of the Reply interface.
Click ADD FILTER.
In the Filter name field, enter the name for you filter (optionally).
In the Property field, select Gender custom field.
Select the Equals Male condition.
Click Save to save the filter and see filtered results.
Save the filtered results to a separate list or move them to your sequence.