Inserting Blocks with customized menus

Hello Again
I tried to make a menu with Insertion of Blocks(drawings in the hard
disk),
but i have a dissapointment result, i used to made it the same way that
in former releases, but i'm not pretty sure where to put the blocks or
drawings, !in the support carpet??. maybe??
I'll appreciate any help even if anyone can send a little sample of the menu
text where the blocks insertion appears.

 

Here's a clip from what I use. The blocks are in a "Base symbols"
folder that's included in the AutoCad search path, at the top of the
files list.

(defun C:insert_3panel42 ()
(setvar "cmdecho" 0)
(setpower)
(setq ds (getvar "dimscale"))
(prompt "\nSelect insertion point... ")
(command "_insert" "E_3PANEL42" "PS" ds pause ds ds pause)
(PRINC)
)

(defun setpower ()
(if
(null (tblsearch "layer" "power"))
(command "-layer" "make" "power" "color" "cyan" "power" "")
)
(setvar "clayer" "power")
)