Add a feature to link threads

Descriiption of feature request
A feature to be able to link one thread to another in the same directory, at least. Better if it works on entire project.
What problem(s) would this feature solve?
It’s not possible build a logical sequence of steps or even concepts in threads. I often use it to explain something and is harder to this without the ability to link pieces of code and show how they are related to each other.
Explain what you were trying to do when you came across the problem leading to this feature request
Basically trying to describe some node Express features, but was not able to show diffrent pieces of code that were related.