How to put custom macros to make a subfolder in node menu ?

Hello,
I came back to Fusion recently and I totally forgot where to save macro in a sub menu instead have them only in the macro menu. Like in my screenshot, I want to have my MB_ macro in a sub menu called MB for exemple.
Thank you,
PS : If you have ressouces also to customize my macro to have sub menu inside them like in nuke, I got it too
Matt
Screenshot : https://ibb.co/mrzmkrNZ
I came back to Fusion recently and I totally forgot where to save macro in a sub menu instead have them only in the macro menu. Like in my screenshot, I want to have my MB_ macro in a sub menu called MB for exemple.
Thank you,
PS : If you have ressouces also to customize my macro to have sub menu inside them like in nuke, I got it too

Matt
Screenshot : https://ibb.co/mrzmkrNZ