import Multiples Dgn's to single Dwg

Please suggest how to change the code accordingly

(VL-LOAD-COM)

(defun C:D2D (/path dgnfile SDI_Mode)

(setq path

((setq DirPath (acet-ui-pickdir))

(setq ref (vlax-get-acad-object))

(SETQ FILES (VLA-GET-FILES

(VLA-GET-PREFERENCES ref)))

(SETQ OLDSUPPORT (VLA-GET-SUPPORTPATH FILES))

(SETQ NEWPATH (STRCAT OLDSUPPORT ";" DirPath ";"))

(VLA-PUT-SUPPORTPATH FILES NEWPATH));;Default path for DGN files location.

DGNIMPORTMODE 0 ;;Imports the DGN file in a new drawing file.

SDI_Mode SDI ;;Save Current SDI MODE

SDI 1 ;;SET Single Drawing Mode for AutoCAD.

)

(setq files (vl-directory-files path "*.dgn"))

(foreach dgnfile files

(command "-dgnimport" (strcat path dgnfile) "" "" "" "y" (strcat path dgnfile ".dwg"))

)

)

You have a few problems you need to use (setvar "variable name" value) and (setq Sdi_mode (getvar "sdimode"))

Please read the Code Posting Guidelines and edit your post to include the Code in Code Tags.

Adjusted but not tested

(VL-LOAD-COM)
(defun C:2D (/path dgnfile SDI_Mode)
(setq path (setq DirPath (acet-ui-pickdir)))
(setq ref (vlax-get-acad-object))
(SETQ FILES (VLA-GET-FILES (VLA-GET-PREFERENCES ref)))
(SETQ OLDSUPPORT (VLA-GET-SUPPORTPATH FILES))
(SETQ NEWPATH (STRCAT OLDSUPPORT ";" DirPath ";"))
(VLA-PUT-SUPPORTPATH FILES NEWPATH);;Default path for DGN files location.
(setvar "DGNIMPORTMODE" 0) ;;Imports the DGN file in a new drawing file.
(setq SDI (getvar "SDI_Mode"))  ;;Save Current SDI MODE
(setvar "SDI_mode"  1) ;;SET Single Drawing Mode for AutoCAD.
(setq files (vl-directory-files path "*.dgn"))
(foreach dgnfile files
(command "-dgnimport" (strcat path dgnfile) "" "" "" "y" (strcat path dgnfile ".dwg"))
) ; foreach
) ; defun