When you connect with the vSphere 6.7 Web Client, a VM has an OVF export option but there is no OVA option.
If you would like to export a VM as an OVA file, you can use OVF tool on the command line.
To export many VMs, you could use the commands in a script.
When you go to the VMware website downloads menu and select OVF tool, the Windows version displays for you to download.
To use another version (for example, Mac or Linux), then go to the main Downloads page and search for "ovf tool".
The Windows and Mac versions are standard installer packages.
The Linux version is a bundle package, and you can easily install it from the command line by executing the bundle with a shell command. Replace ovftool.bundle with the name of the bundle file.
To work with OVF tool, you will need your vCenter URL and credentials, and you will also need the path to your VM.
If you don't know the VM path, you can discover it. For example, enter the vCenter URL and credentials.
This is not a VM, so the tool will return an error message for the "wrong kind of object", for example, a folder or a datacenter.
It will suggest possible completions, which are the objects under the path you have entered. Keep adding completions until you get to the "vm" folder and select a VM.
For example, a VM could have this path.
With OVF tool, the default vi command displays a friendly version the OVF details.
In this example, the user entered the administrator and password interactively.
To download the OVA file, enter "vi://" with the VM path and with a local file with an ".ova" suffix at the end.
You should now be able to upload the template into the Apps library for users to deploy.
On Linux, remember to escape any special characters in your password that may be interpreted by the shell.
After you upload the VM template, remember to select the option to generate conversions to other hypervisor formats as required.