It should be fairly simple to assign all GND pins to the GND signal. To make it easy to see you can filter the Pins list so that only GND pins are displayed. You can then drag the signal from the Signals list onto the Pins list as a single operation, or you can ctrl-a on the Pins list and drag all pins onto the Signals list. See attached docx file.
GND_assignment.docx 70.1 KB
Thank you Terry for your valuable reply.