How can I add a unit to an existing line?
Open the Configurator for the line you want to add a unit to. Underneath the Drawing is theMull Unit button. Click this button to open the location selection screen.
Select where you want to mull the additional unit, and click Next.
Now answer the questions in the configurator just like you would for any other unit. When you click Finish, you will be brought back to the original line item, with the new unit added.