Re: Can we use vCloud's action in vCenter ????

To create the same workflow for vCenter vm, when there is no 1:1 mapping at the API level, you have to:

1. Be familiar with both systems - vCloud and vCenter.
2. Get familiar with both plug-ins' API and how much of system functionality is exposed via scripting API. Maybe there is disk attaching functionality in vCenter but it is not exposed in the API? Or maybe the same functionality can be achieved by calling one or more other scripting methods?
3. In the worst case, you may need to look at implementation details, eg. at Java code to see what exactly attachDisk() scripting method does. Maybe this Java code calls some low-level API available only in vCloud?

In short, I doubt there is a quick way or drop-in replacement for existing vCloud workflow/action to make it work with vCenter vm objects.