You can view and manage your contacts by grouping them in Dex.

Groups Page
You can access the Groups page through the shortcut key G + D.On this page, you can create, edit, or delete a group or assign existing or new contacts to a group by drag-and-drop.
Subgroups
Need to specify the groups more? Create a subgroup for your groups!Simply click on the ’+ Add new group’ button and assign it to a Parent Group!