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When working with True Colour values, it is usually easier to manipulate the existing AcCmColor object associated with the layer object, e.g.: (defun createlayer ( name color linetype lineweight / lay tru ) (setq lay (vla-add (vla-get-layers (vla-get-activedocument (vlax-get-acad-object))) name)) (if (listp color) (progn (setq tru (vla-get-truecolor lay)) (apply 'vla-setrgb (cons tru color)) (vla-put-truecolor lay tru) ) (vla-put-color lay color) ) (vla-put-linetype lay linetype) (vla-put-lineweight lay lineweight) lay ) Which you can call either with an ACI colour value or list of red, green & blue values: (createlayer "test1" 2 "Continuous" aclnwtbylwdefault) (createlayer "test2" '(100 150 200) "Continuous" aclnwtbylwdefault) Note that this assumes that the supplied linetype is already defined within the active drawing. I would also suggest supplying the Layer Collection as an argument rather than evaluating vlax-get-acad-object for each layer created.

If you are using AutoCAD 2007 as shown in your profile, I would suggest downloading the FREE latest version of DWGTrueView and use that to plot, I never liked the early version of the plot to PDF myself and I believe they improved it in 2016 version.. From Autodesk Help File AutoCAD 2007 To create a PDF file from an AutoCAD® drawing Click File menu > Plot. Select DWG To PDF.pc3 from the Printer/Plotter drop-down list. Configure other settings in the Plot dialog box, if necessary. Click OK. Enter a name for the PDF file and save it to the desired location.

Autocad has "DWG to pdf" as a printer it should be just there in the available printers. There are some good tutorials about using layouts and plotting search here 1st or Google.

You must first locate or create a plotter. Some are free to download. Install the plotter. Use that plotter to print as you would any other device. It will ask for a folder to put the PDF into. If that's not enough information, ask a more detailed question.

Thank you very much. Everything clear now