How do I use OPC OpcNetApi Complex Data type for User Defined Types in PLC C#

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C#5.0

UDT

I have a user defined type [UDT] in a PLC, I am trying to access the type using the OPC.CPX item type.
How do I create the CPX item and define the structure for the UDT for example :
I have a user defined type 'Machine' in the PLC with
Machine.Start bool
Machine.Stop bool
Machine.HMIName string
Machine.Hours DInt
Machine.Params[] DInt32

I know how to get these as individual tag elements Opc.Da.Items , but how can I do this with a CPX type so I can treat the thing as an object that it is., rather than pieces of the object. [Consider if I have 1000 machines , I do not want to use 5,000 individual tags to read and write , and I also want to read as an object and write as an object etc..
- this makes it much easier for me to update my poco's that represent the UDT's as well.


Any help is appreciated thanks in advance.