You can't, but...

We found an answer to your question in an Autodesk discussion group! I hope it help.
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Reply From: Jeff Mishler
Date: Jan/06/06 - 19:35 (GMT)
Reply
Re: CHANGING LAND DESKTOP DEFULT PROFILE GRID SETTINGS
You can't. You can, however, setup a toolbar button with a call to a small
lisp routine to reset the layers to your prferences after they are created.
Here's what I use:
(defun c

ro_lay ()
(vl-load-com)
(if (not (tblsearch "ltype" "D125"))
(command "-linetype" "load" "D125" "" "")
)
(vlax-for lay (vla-get-layers (vla-get-activedocument
(vlax-get-acad-object)))
(cond
((wcmatch (vla-get-name lay) "*PBASE,*PVGRID")(vla-put-color lay 2))
((wcmatch (vla-get-name lay) "*PFGC")(vla-put-color lay 6))
((wcmatch (vla-get-name lay) "*PEGC*")(vla-put-color lay
3)(vla-put-linetype lay "D125"))
((wcmatch (vla-get-name lay) "*PGRID")(vla-put-color lay 8))
)
)
(vla-regen (vla-get-activedocument (vlax-get-acad-object))
acActiveViewport)
(princ)
)
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