Creating a bold face from the roman

Hello Glyphs people,
While finishing my regular roman and italic (I’ll need about 6 months), I want to orientate on creating the bold roman. Of course I know how to draw a bold, based on the regular. But, what’s the best way working in the Glyphs program? I see many articles on interpolating, but not on creating the first bold (necessary for interpolation). (set up a new master, weight, with, etc.)
Thanks, Titus

I eyeball the values in the master and then, I use a lot of nudging while editing. That’s about it.