User Guide

FontLab 4
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Expanding the Master
Use Tools > Multiple Master > Expand Master to copy the contents
of one of the masters to all other masters. If this command is selected when
the Glyph window is active, it is applied to the currently active master. If it
is used when the Font window is active, you will see a dialog box that lets
you select the master for copying:
This operation may be useful if applied when the Mask layer is in editing
mode – you may need to copy one of the Mask masters to all the other
masters to simulate the single-master Mask layer.