You can expand a workload domain by adding VxRail clusters using the SDDC Manager and VxRail Manager UIs, or using the Workflow Optimization script.
- After imaging the workload domain nodes, perform the VxRail first run (VxRail Manager UI)
- Add the VxRail cluster to the workload domain (SDDC Manager UI)
Alternatively, you can use the Workflow Optimzation script to perform all of the steps to expand a workload domain in one place. See Add a VxRail Cluster Using the Workflow Optimization Script.