How do I select part of an audio track in GarageBand 10.3.2?
Edit: Sorry. Just noticed you asked for GarageBand and not Logic. Updated answer for GarageBand which has fewer split options.

You have to split the track. Once you've split it, you'll be able to copy the region onto the clipboard and paste into another project.

You can split at the playhead position using Edit > Split Regions at Playhead or use the Cmd-T keyboard shortcut.



Just put the playhead at 23.25, split. Move it to 25.00 and split again. Then you'll have a region you can select and copy onto the clipboard.