Show accurate percentage completion based on a specific set of slides or Scenes?

I need to add an indicator for users to show their current completion percentage.

However, the course branches into 6 different directions and users only need to follow one to get to the end. If I use the Project.Progress variable it calculates all of the slides in the project, even those that the user will not view.

It is possible to basically calculate the completion percentage based on a specific set of slides or Scenes?

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