How do you handle selling courses and offering extra content through funnels like up selling? like clickfunnel.

Hey everyone, I’m exploring an idea for a tool to help course creators manage selling their courses and creating funnels for extra content or offers. I’m curious how you currently set up your sales process—like main course sales, order bumps, or additional modules—and what tools you use to make it work.

Which parts of this process feel messy or frustrating with the tools you have now? I want to hear from people actually running funnels so I can understand where the real bottlenecks are before building anything.