is there any other way other than using Networking cable to transfer or copy files from computer to WD TV Live Hub

Yes, and your subject is the answer:   Via USB.

Copy files from your PC to a USB device (hard disk, flash device, whatever)

Take the USB device and plug it into the USB port of the Hub.

From there, you can either PLAY them, COPY or MOVE them, or SYNC them to the Hub’s internal drive.