For automation purposes, customers use the handy OVFTool, which is a multi-platform command-line utility for uploading or exporting OVF/OVA images. During an upload, users would typically specify the --network argument which will assign the desired vSphere Network to the deployed VM and if the VM included multiple network adapters, it would assign the same network which can then be modified during post-deployment.
What if you had a OVF/OVA that included multiple network adapters and you wanted a different network for each adapter? Luckily, this is also supported with OVFTool by using the --nic argument, which expects the network name as codified within the OVF/OVA to tell OVFTool which vSphere Network to assign. You can find OVF/OVA network name by simply running OVFTool command against the OVF/OVA without any arguments and you should see the name as shown in the screenshot below.
Note: The network name in the OVF/OVA MUST be unique to be able to assign different networks during upload.