OK, so admittedly calling this one a “HOWTO” may be giving the snippet delusions of grandeur. At best, it's a tip -- at worst, it's something self-evident that everybody knows already :)

However, since I had to look it up I thought I might save at least one other person the trouble. To add a menu break (those little horizontal separator bars you see in regular Windows menus) to an Action menu, just do the following:

With MyBase.Actions
.Add(GetNextActionID, "~", "")
End With