Hi Paul!
Glad my idea helped You out. There is another approach that I didn't mention in my post as I didn't want to get too many ingredients in the recipe.
There might be a time when You simply want to go back to the same time in a given scene from another scene. e.g. The viewer clicks a button in Scene 1 to go to Scene 2. A "Back" button in scene 2 returns them to the same time in Scene 1 as they left it.
Below are two posts that describe this approach. Both are included here as they might have something in each of them that that adds to your understanding of the process.