To share the virtual machines to different platform the VDI that is virtual device interfaces has to be shared between both the OS so that they can read and write the file. There is a provision to create a new virtual machine on a system and select the VDI from the host on which you are currently working and select it as a hard drive with the same previous settings. The settings like MAC address and virtual NICs cards also have to be same to avoid the problem of activation. To share the command that can be written is as follows:

Machine uuid= "{ some hex value}" name= "name of your OS" OSType= "Type of OS you are using"