[Zubersoft]

You would need to purchase MobileSheets for Windows 10 through the Microsoft Store if you wanted to be able to manage your library on your PC, and then synchronize those changes to your Android tablet. The companion application is just a free tool that lets you connect to a device running MobileSheets and manage the library on that device. It's not a tool that can be used to set up the library without an active connection. 

Mike