Use both the Switch & Load and Splitter junction boxes in unison.
Use the Switch & Load to bring in power, and connect your switch. The load inlet can then be connected to a Splitter.
The Splitter should be employed in a room or area with more than one luminaire. All inlets on a Splitter are the same, and provide three ‘load’ inlets to plug-in luminaires.
To move on to another circuit or room with multiple lights, use the second power inlet on your Switch & Load to connect another Switch & Load. You can then take power to the next circuit or room and start a new circuit with a separate switch. Use a Splitter as required, and repeat process.