To Connect Audio Part do the Bar - Like Music Mode

Hello everybody,

music Mode sometimes isn´t working, so you have do do the Timestretch. After that i would be lucky, if i knew, how to connect the Audio Part to the Bar in the Project Window. If I knew, i Could change the Tempo and my (non music mode)Part would stay on the same place of my Composition. Is this possible with cubase pro?
Thank you for your answer.
Friendly Greetings,
Alex

It is not working? I have a 100% success with this functionality. Do you maybe mean that not all audio files automatically get the correct tempo and need to be prepared manually?