Transcriptions often will isolate a specific riff in a box, and then refer to that riff elsewhere in the score ( such as "Use Riff 1" ). You can do this with MusEdit as follows:
Indent the riff lines as follows:
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Draw a box around the indented lines
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Note: If you ever want to select and change an extended object in the staff lines enclosed by the box, you will have to first click on the box and drag it out of the way, then select the extended object and make the change, then drag the box back into place.
Here is an example of a box around a riff: