Tutorial on Interim Masters?

I have a situation where only a few glyphs need intervention to correct for weight gain. I understand that this is allowed for in Glyphs4. Where can I see an explanation on how to do it?

As a clarification to my question. I have designed alternate “W” glyphs (and their diacritic partners), but the alternate looks bad in the heavier weights. Can I find a way to eliminate the alt glyphs from only the bolder weights?

Have a look at this tutorial:

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I will give it a look! Thanks, Florian!