The Insert Panel Tab command is used to change the appearance of custom panel blocks on the one-line diagram. It is for drafting purposes only and is not otherwise used.
To insert a panel tab on a distribution equipment, go to
Ribbon: DM Electrical->One-Line Diagram-> 
Insert Panel Tab
Pulldown Menu: DM Electrical->One-Line Diagram->Insert Panel Tab
You will be prompted to select the distribution equipment on which to insert the panel tab.
Select distribution equipment to add tab to:
Select the distribution equipment and the tab will appear on the block as shown below.
