Use a selection to set the project tempo
Just like automatic tempo matching functions in the main window, you can set the project tempo to match the current locator positions and selected area in the Audio File Editor.
Although this operation is similar to the one described in Match the tempo to an audio region, it applies only to the selected area of the audio file in the Audio File Editor, rather than to the overall length of the region.
Use an audio file selection and locators to set the project tempo
Click-hold the start or end of the area you want to select in the waveform display, then drag to the right or left.
Adjust the locator positions in the control bar or ruler, if necessary.
Choose Functions > Adjust Tempo by Selection and Locators.
The project tempo changes in accordance with the current locator positions and selected area in the Audio File Editor.