@Peter-Robinson1230 You can place audio files in the arrangement and enter the orginal BPM for each audio object in the object editor and also enter a new BPM. The audio object will then be time-stretched to the new BPM. You also have a Remix Agent feature which will let you manually compute the BPM of a given audio object.

This will not work if your audio tracks aren't forced to a steady beat grid but have small time fluctuations. Music Studio cannot even this out automatically.

A software like Melodyne can do this. You just need to load an audio track inside it (and use, for example, the percussive algorithm) and it detects the tempo and fluctuations very well. You can activate Auto-Stretch to force your audio to a steady beat and load additonal audio tracks that will also be forced to this beat.