Okay let me explain you . . I am working on building a workflow where i want to increase the no of Cpu, Memory and Storage and for that requirement ,I had noticed that some of the Action are Present in vCloud Director Package in vCO, I want to use them for vms to increase above mentioned compute resources for VMs in vCenter but not vCloud Director.
I am finding difficulties to use them as they are giving follwoing error
TypeError: Cannot find function attachDisk in object DynamicWrapper (Instance) : [VcVirtualMachine]-[class com.vmware.vmo.plugin.vi4.model.VimVirtualMachine] -- VALUE : VirtualMachine<vm-2901>'Testing'. (Dynamic Script Module name : attachDiskVM_SN#4)
I hope you could getmy pain point and be able to help me out 
Thanks !!