Restricting access to a path in Storyline

You could have users indicate up front whether or not they're "Leaders." Since it's just a 2-options choice, I'd use a T/F variable that's changed to True if the user is a Leader. Then use triggers with conditions to show the additional content if the variable = True.

• This post has a file that demonstrates how to branch based on the user's initial selection(s). It's not exactly what you want to do, but it should help you understand the kind of triggers you'll need.  https://community.articulate.com/discussions/discuss/tip-let-the-user-choose-their-path/1198627 

You still have to consider how to track completion. For example, you could have a "Complete course" trigger at the end of the basic HR 101 content with a condition that the variable = False (that is, the user isn't a Leader). Have another "Complete course" trigger run at the end of the Leader content. 

Of course, none of that ensures that a Leader will indicate that they are a Leader at the start of the course. If they realize that involves extra content, they could pretend to be a regular employee. It's also possible that a regular employee could say they're a "Leader," and then see that restricted content.

I think the best way to ensure that Leaders (and only Leaders) go through their required content is to put that in a separate course that is only assigned to the Leaders.