In order to create a field which automatically takes the known values from inside your contacts database, you need to create a autofilled selectbox field. Here we describe how you can activate and use this field.

Navitage with the left navigation menu towards your Fields section.

Once you have clicked the Fields section.

When you adapt or create a new field by clicking or the  or button. 

Inside the popup which opens up, you need to specify the field type as autofilled selectbox.

With the autofill values buttopn, you populate this field with values already known present in contacts database.

Now when you search this button will be presented as a dropdown selcetion box with the known values for this field.