Add Measures dialog box

How to get there

CTRL-click the Measure tool .
Choose Edit > Add Measures.

What it does

This dialog box lets you specify how many new measures you want added to the end of the score. When you add measures, the Measure Width and Position Notes Evenly settings in the Measure Attributes dialog box from the last measure in the piece are copied into the new added measures. See Measure Attributes dialog box for details on these settings.

How many measures? In this text box, enter the number of new measures you want added.
OK • Cancel. Click OK to add the specified measures, or Cancel to leave the score unchanged, and return to the score.