First, we need to load up the old iDMSS Plus or gDMSS Plus application.
Go to Home and select Device.
Click the Blue button on lower right (Create contact card - see first image below)
Select up to 10 devices at once (Each Device Card can store a maximum of 10 devices total, so you may need to create multiple cards/ QR Icons). Once finished, tap the Create Device Card button.
It will prompt you to create a password for this card (Confirm to enter device password when importing device?) Choose Yes, and create a password for this device list.

Once the QR Code has been generated, click the Save icon in the Upper Right Corner to save to your Photo Album
Now, we need to open the DMSS application.
Choose the "+" sign in the upper right corner to Add, then select SN/Scan.
Now instead of scanning anything, tap the picture icon in the upper right corner of the Add Device page.

Select the QR code image generated earlier from your Photo Album. Then tap the Save icon in the upper right corner.
You will be prompted to key in the Device Card password you generated earlier. Once keyed in, all devices from the Device Card should should now load in the DMSS Home page Device list.
You may need to repeat this process if you have more than 10 devices stored on (g/i)DMSS Plus.