Save yourself from building a single layout with hundreds of modules that make it difficult to maintain. Subsystems let you manage the complexity of large systems with no overhead.
For more info: https://w.dspconcepts.com/
0:00 Intro
0:10 Subsystems
1:04 Pins in Subsystems
1:41 Example of Creating a Subsystem in Audio Weaver
3:32 Adding a Pin to the Subsystem