How do I save value from dropdownlist to local variable of my customViewModel in MVC 3

I don't know how i should write  ViewModel exactly. In same view I need to do read, update and create. In first, I thought it won't be a big deal, but now, it seems it is. (asp.net MVC 3)

For example:

I have: object1, object2 and object3

object1 is just to be read in [HttpGet]
object2 is created in [httpPost]
object3 is updated in [httpPost]

For update I don't have anything to bind to model, so I need a local variable to make this work.
How do I implement helper variable just for saving what user selected from dropdown so I can save object2 and object3 correctly?

Thanks
vjerchAsked:
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