Logic Pro automatically inserts a tempo change, which appears in the Tempo track.
Moving from left to right, beat map the subsequent notes in the selected regions, repeating the same steps.
To connect a ruler position to a position in the region where no note exists, press and hold Control while drawing the connecting line. This allows the line to snap to any subdivision, even where there is no note event.
To erase a beat mapping, double-click it with the Eraser tool, or select it and press the Delete key.
To erase all beat mappings, click anywhere in the header of the Beat Mapping track (except on the controls) to select all data in the track, then press the Delete key.
When using the Delete key, be careful not to accidentally delete other selected events or regions.
Download the guides:
Logic Pro User Guide: PDF
Logic Pro Effects: PDF