Editing : Editing Basics : Basic Editing Commands : Repeat To Fill Selection

Repeat To Fill Selection
The Repeat to Fill Selection command lets you automatically fill a selection with audio or MIDI clips or data without requiring that you manually duplicate the clips. To use Repeat to Fill Selection, Cut or Copy a clip, then make a selection and use the command to fill the selection. When pasting audio clips, you are prompted to specify a crossfade to be used for the pasted clips.
If you fill an area that is an exact multiple of the copied clip size (for example, filling 16 bars with a 4-bar clip), the copied selection is pasted as many times as it takes to fill the selection. If you fill an area that is not an exact multiple of the copied clip size (for example, filling 15 seconds of a track with a 2-second clip of room noise), the remaining selection area is filled with an automatically trimmed version of the original selection.
To fill a selection with Repeat to Fill Selection:
1 Select the clip you want to copy.
2 Choose Edit > Copy.
3 Select the area you want to fill using the Selector tool and choose Edit > Paste Special > Repeat to Fill Selection.
4 Do one of the following:
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If pasting audio clips to larger areas, the Batch Fades dialog opens. Configure the dialog to create crossfades between each pasted clip, then click OK.
– or – 
*   
If you do not want crossfades for the pasted audio, click Cancel in the Batch Fades dialog.