To check if the subdirectory "mysubdir" exists I use code

on error do mkdir
CD mysubdir
cd ..
on erro

proc mkdir
md mysubdir
cd mysubdir
endproc

The program moves to the subdirectory OK, but it does not return to the parent directory when the command " cd .." is used.

How to make "cd .." working ?
TIA, AHWBGA

Ed