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There’s no GUI option to export an OVA (Open Virtual Appliance) format VM in VMware fusion, but there is a command-line method. Use the OVF tool. The following provides a command-line synopsis.
$ cd /Applications/VMware\ Fusion.app/Contents/Library/VMware\ OVF\ Tool/
$ ./ovftool –acceptAllEulas \
> /Users/me/Documents/Virtual\ Machines.localized/TheVM.vmwarevm/TheVM.vmx \
Opening VMX source: […]
Opening OVA target: […]
Writing OVA package: /Users/me/Desktop/TheVM.ova