There are multiple methods that can be used to connect the tubes on the Storefront lighting kit.
Option A would be by connecting the tubes to the splitter harness which will allow you to plug 4 tubes into 1 port on the control box. This option is good for mounting multiple tubes in the same area.
Option B would allow you to daisy chain the tubes from end to end. This option is good for spreading the lights out across a large area.