Import a master in a glyphs file

Hi.
Now I’m collaborating with another person who drew and exported two different otf. files but he didn’t work with glyphs so I just open the otf. with glyphs. The two files are different weights from the same font family and since I need to work on this too I’d need to have both regular and bold on the same glyphs file. I can open just one of these but don’t know how to import the other weight as a second master in the same working file.
Anyone knows how to solve this?
Thank you.

File > Font Info > Masters > click on bottom left plus button > Add other Font

Thank you!

I updated the Import Existing Fonts tutorial with Multiple Master stuff and links that may help you.

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