Create new "category" of functions

Dear all,

I have created some functions in my macros. If I select a cell and try to "insert funtion" in this cell, my created functions appear inside the "user defined functions" category.

Is it possible to create different categories of functions (as the already existing "text", "financial", "date & time",...) in order to divide all my functions between these new categories and have a clear structure, instead of having all of them mixed

Thanks!