Hello!
I’m new to Glide and attempting to create a Module that links to multiple lessons, and each lesson when selected by the user would then link to multiple sub categories. However, I am struggling to create the “menu within a menu” because the lessons are linked to the module via a relations column, so I am struggling to understand how to link my sub categories. Does anyone know how to get around this problem?
The relation linking Module to Lessons needs to be in the parent table (ie. the Module table). When viewing the detail screen for a specific module, you can then add a collection sourced from the relation which will only list the Lessons associated with the module you are viewing. Likewise, you can do the same thing linking Lessons to Sub-Categories. Create a relation in the Lessons table linking to the Sub-Categories table and place a collection sourced from that relation on the Lesson detail screen.
Thank you Jeff!
Everything worked as you said, but the one issue I’m having now is that in the final step (Modules>Lessons>Sublessons) when the user clicks on sublessons all of the text appears at once instead of as clickable options in a list format. Would you know why this is the case?
Can you attach a screenshot? What do you mean by “all of the text appears at once”?
Thank you for the willingness to help! Actually I got this portion of the problem figured out. 
Thank you so much!
This worked perfectly.