Help me to understand concept of lisp languge at this qustion ?

How i can bundle two function A1 ,A2 command in lisp that when running A1 command after finish the a command automatically run A2 ??

(that A1 , A2 dont have any argoman or variable when defun them)

This?

(defun C:A1 ( / var... ) ; or ( / var... A2 etc.. ) to localize

(defun C:A2 ( / var...)
;....code of A2 here
) ;end of defun A2

;or
(defun etc ( / var)
;...code of etc here
) ;end of defun etc

;.....code of A1 here

(C:A2) ;to call A2

(etc) ;to call etc

) ;end of defun A1