How can I copy glyphs from a certain master to another file?

I have a glyphs file consists of a few masters and I don’t know the most efficient way to copy certain glyphs from one of the masters to another glyphs file. For copying I mean copy the “entire thing” including the contour shapes, side-bearings, and (if possible) kerning groups and kerning values.

I tried to just select the glyphs in the master I want and copy them to another file but it would only copy the glyphs from the FIRST master. I have to delete all other masters to copy the glyphs that are not in the first master. Is there an easier way to do it? Thanks!

Paste special. Hold down the option key when pasting.

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Thanks!