Acrobat Pro

@matti_8082 Hate to say it, Acrobat is good at creating and modifying PDF documents, it's not designed to handle the complex, layered, and vector-based data of a DWG file in the same way that a program like AutoCAD is. When you convert a DWG to a PDF, you are essentially creating a static "snapshot" of the drawing. You can still do some things to the resulting PDF, but you can't edit the underlying CAD geometry (change the lines, shapes, or layers of the original CAD drawing.)