the best & normal way is to ftp your line to the box, its is possible to do it via the remote IF you have tspanel on the box but many dont as they dont want that bloated software messing up their box, not possible to transfer line via usb on zgemma.
Whats stopping you using filezilla to ftp the same as everyone else? its free, simple to use & there are plenty of posts showing what to do IF you are unsure!