Also - your quality mileage may vary with this tip - if you have symbols in existing AutCAD dwg files - or create a dwg containing only the 2D Autocad symbols you are interested in...and those symbols exist as autocad 'blocks' - then you can convert them to GDL library objects in one step via the command:
File > Libraries and Objects > Import Blocks from DXF/DWG
You will be asked to browse to a folder and/or make one. All of the converted objects will be created in the indicated location.
One of the forum moderators • AC 26 USA and earlier • MacOS 11.6.8, iMac Pro