Is there a 'master' tempo that also affects tempo maps?

For example, I would like to slow down a track that has it’s own tempo map. Thanks.

Not really it’s either fixed global tempo or tempo map.

I’m sure there must be an easier way to do this that I can’t think of but one option would be to open the tempo track in the project window, hit ctrl a to select every point on it and use the vertical scaling option to affect overall tempo.