Click on the Range button to enter the Range Editing Mode. This allows non-destructive editing within samples. The files on disk are not affected - only how they are played.
Click in a sample on the Timeline to mark the start of a range. Alt-click at a later point to mark the end. The later point can be on another track so that your range spans several tracks. You can Alt-click again to move the end point.
The current positions are shown in the Begin and End panels.
Having marked a Range, you can cut, copy or paste it by using the buttons on the Timeline. The keyboard short cuts x, c and v also work. (You don't have to hold down an Amiga key as in other programs). Having cut out or copied a range, you can click the mouse anywhere on any track to mark a destination. You can click either in a sample or in a silent part of the track, or on the next unused track. Hitting the Paste button or V on the keyboard will then place the range at that point.
If there is already a sample there, it will be cut at that point and replaced by the pasted range. If you paste into the middle of a longer sample, you will end up with three separate sections.

Range Editing