BIM LISP - how to create categories under a new property set

I am new to LISP programming and using the LDSP

I want to create a user-created Property Set and a bunch of properties automatically every time I run this lisp.

(defun c:BANG ()
(vl-load-bim)
(bim:create-propertyset "TESTSET" "---TESTSET---" T NIL) T
)




How do i create the list of New Property in my 2nd screenshot?

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