Linking buttons

Before I continue, I'd like to state that I've been "forum trolling" to try and find an answer to this but have been unsuccessful in finding a helpful answer within another post. If this has already been answered, I apologize for this redundancy.

I've been trying to assemble a series of software lessons into a single module for my company. We designed and scripted the different modules on various topics and recorded them as such. After editing the individual lessons into a usable format, I put them together into one large master lesson file. My intention is to have the lesson load and, along a brief recorded introduction, give the user a series of buttons which they can click to load into the lesson file, while having the rest of the lessons "unclickable" until they have completed earlier lessons. However, I'm having a bit of trouble achieving my idea for a table of contents within Captivate. Here's my problem...

Let's say I had 3 lessons in a module - Lesson A, B +C. After the intro, they would be able to click on the active Lesson A, but lessons B+C would be in active. However, once watching and completing Lesson A, the users would then be brought back to the "main menu" and Lesson B would now be active would be able to watch that lesson. Now, I was planning on making multiple "main menu" slides that would the lessons would link to on completion. So Main Menu 1 would have only have Lesson A active, but Main Menu 2 (linked to at the end of Lesson A) would have have both Lesson A+B active. I want these previously viewed lessons active so that the user can jump into them and rewatch them as needed. The problem is that, with how I have the lessons linked right now, if the users rewatch an earlier lesson, the will be linked back to an older Main Menu slide with inactive lessons. Any idea how I can fix any of this? I know it's a bit complicated and I'd be happy to clarify any points that are unclear in an attempt to solve my problem. Thank you!