[TYPO3-mvc] Object creation over more actions

[hannes]

  Hallo,
I am quite an extbase beginner, and I run very easily into troubles with 
creating some basic processes :)

I have the following problem at the moment. I want to create an User 
Object over several actions.
Nearly every Object attribute is validated in the model. So have to 
validate only a part of the attributes after every action, so I can not 
use the @dontvalidate annotation.
Is there a nice way to build Objects over several actions? Can I tell 
the action to validate some specief attributes of the object?

Thank you,
Best Regards Hannes