How to import vmdk into ESX 3.x

If you have an existing VM that was removed from VirtualCenter and just need to add it back in then follow the below steps:

Select the ESX server in the VirtualCenter that the VM files are located on
On the summary tab right-click on the datastore that the VM files are located on and click “Browse Datastore”
Select the folder that the VM files are located in
Right-click on the VMX file for the VM and select “Add to Inventory”
Select a name and location for the VM and click Next
Select the Host or Cluster for the VM and click Next
Select a Resource Pool and click Next
Click Finish and the VM will now appear in VirtualCenter