The user interface of SDDC Manager lacks the functionality to directly integrate hosts with multiple physical NICs in workload domains in VMware Cloud Foundation. Use the public API of VMware Cloud Foundation to extend the SDDC with workload domains, clusters, and individual multi-NIC hosts.
In VMware Cloud Foundation 3.10, you can use a public API to automate deployments by using SDDC Manager on hosts with mulitple physical NICs. For information on the API, see VMware Cloud Foundation 3.10 API on VMware {code}.