Timeline issues

ok, the movie i’m creating has an intro animation and an outro animation. i set it up like this:

click on a button and the intro animation starts… ok not hard to do
now if i click on another button, the outro animation will play into the intro animation of the next page… hope that made sense.

now that wouldn’t be an issue if the user always clicked the buttons in a specific order following the timeline…but that is unlikely.

so my question is: do i need to add if statements to the buttons that say “play this first and if this is clicked play this and then play that”?..hope that makes sense.

thanks for reading and good luck understanding my jibberish,

Andre