[Patrick C]

Is there a way to run a macro from a custom menu?
Are you referring to a custom menu bar entry (Tools → Customise Menus)?

If yes: In my case this works. I can, for example, add
“M&y Custom Date” to the Insert menu and associate it with “My Macros → MyCustomDateMacro.jsee”

Inserting MyDate then is possible via
Alt+I Y