You can add a vSphere local account as follows:

Procedure:

  1. Go to Manage → Asset Management → Add new asset
  2.  Asset category → Operating system, Asset type → Unix Based, Asset version → VMware ESX/ESXi.
  3. Fill in the details.
  4. Click on Save.
  5. Click on the action button of this asset → Manage linked accounts → Add New Account.
  6. Fill in the details.
  7. Click on Save.