Cut/Copy/Paste Toolbar
From Audacity Development Manual
Cut/Copy/Paste Toolbar provides clickable tools for: Cut, Copy, Paste and Delete.
The Cut/Copy/Paste Toolbar is NOT displayed by default in Audacity. To enable it, click on | and check on Cut/Copy/Paste Toolbar.
Cut Ctrl + X or
Removes the selected audio data and/or labels and places these on the clipboard. By default, any audio or labels to right of the selection are shifted to the left.
Copy Ctrl + C or
Copies the selected audio data and/or labels to the clipboard without removing these from the project.
Paste Ctrl + V or
Paste either inserts the clipboard contents at the position of the selection cursor, or replaces a selected area with the clipboard contents.
The clipboard can only contain one item at a time, so cutting or copying to it always replaces any previous content. However that content may contain multiple audio tracks and/or label tracks of indefinite length, or multiple audio clips.
Delete Ctrl + X or
Removes the selected audio data and/or labels (ad leaves the clipboard as it was). By default, any audio or labels to right of the selection are shifted to the left.