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Obviously we don't have your batch LISP - I guess your company paid for this and so you are not going to be popular sharing that for all online. LISPs can be added to scripts - both as a command and as code. There are others out there such as ScriptPro and Lee Macs Script Writer which will do this. BigAl will often post snippets of scripts here to batch process files - last one he did was in the last week or so ago. You could even set this up as a stand alone script to do just the one task (see BigAls last example....) The first step for all is to get a LISP working as you want and well on a single file and then to do it as a batch (first time running the batch with a new LISP, perhaps check carefully that it doesn't do anything unexpected on other files). Plenty of examples out there to change layer names from one to another - have a look to see if you see one you like to use, or if there isn't am sure we can put one together - and use what is above as a started if you want to have a go, I think all the code you need is in the examples, just need to think how to change them to your needs

Like @rlx this is a hard coded plot pdf using preset values, our dwg's used layouts one title block. the code is hard coded for a A1 sheet plotted as a A3 size. We just walked through the layouts and plotted. So does not matter what current plot settings are as they are ignored. We had multiple devices PDF, A1, A3 Color, A3 B-W. So code for each. (setvar "textfill" 1) (setvar "fillmode" 1) (COMMAND "-PLOT" "Y" "" "Plot To PDF" "Iso full bleed A3 (420.00 x 297.00 MM)" "m" "LANDSCAPE" "N" "W" "-6,-6" "807,560" "1=2" "C" "y" "Acad.ctb" "Y" "n" "n" "n" pdfName "N" "y" )

maybe just something simple as : (setvar "filedia" 0) (command ".-plot" "No" "" "" "" (strcat (getvar 'dwgprefix) (getvar 'ctab) ".pdf") "No" "Yes") (setvar "filedia" 1)