make your variables global:

_global.myVar = 5;

variables in a scene are available in all scenes. They are at the _root
level.

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NOTE: the variable is then also available then in all movie clips and loaded
movies and .. well .. globally.

If you only want it in scenes, just use a variable at the scene level and it
will be available in all other scenes of that movie .. no need to do
anything special at all.