Phoneburner allows the creation of Sub-folders (one layer) under a main folder to help you organize your contacts. For the purpose or search or linking to leadstreams, etc. The sub-folder is still treated as a separate folder.
To do this, Go to your folders in the Contact manager and click the gear icon to Manage folders.
Click on Re-order to move folders and change order or create a sub folder .
You can drag and drop to order the folders and to create a sub-folder, just drag to the right and drop.