There are many tools available online these days to convert PDF files to .step files. You can google for that or either you can use HIPDF software.
You can check the conversion progress in LibreOffice by pressing the Ctrl-Shift-G shortcut: PDF to HTML: Click on the convert icon in the LibreOffice toolbar. Please note that when you use this function in the Open Document Viewer application (F11), you don’t get the preview shown in the LibreOffice Text Editor. In our tests, this option produced the most accurate result. To convert the PDF document to HTML, simply click on “Convert to HTML” in the “Edit Document” dialog and specify the file format as per LibreOffice's instructions. After the conversion, the HTML version will be generated in the same directory as the original file. PDF to Postscript: Go the LibreOffice Text Editor and find the text with the document you’ve used to create your Postscript. Click on the “Page Setup” button (under “Page Tools”) and click on the “PDF” tab. Now you can convert the PDF file to Postscript by using.