VirtualBox can import virtual machines appliance that has been exported to the Open Virtualization Format both from a folder (ovf) or an archive file (ova). Open Virtualization Format is a standard format used by other virtualization platforms such as VMware and QEMU.
Settings for the virtual machine can be re-configured during the import process, based on the previous settings from which the virtual machine was exported.
Steps to import VM appliance to VirtualBox:
Launch
VirtualBox.

Click on
Tools.

Click on the
Import button.

Click on the folder icon to open a file select dialog.

Select
VM appliance with
ova or
ovf extension and click on
Open.

Click on the
Continue button.

Double click on the
VM settings that you want to change.

Set a new value to change.

Change the location to import the
VM to if required.

Change change
MAC address policy if required.

Uncheck if you don't want to force the
VM's disk to be converted to
VirtualBox's
VDI format.

Click on
Import to start importing the
VM appliance to
VirtualBox.

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