Creating a unit-object

Hi,

I have a very straightforward question:

I need to create a unit-object with NX-Journaling. What I found is the command
Session session = Session.GetSession();
SimPart workSimPart = (SimPart)session.Parts.BaseWork;
unit = workSimPart.UnitCollection.FindObject("MilliMeter"); (C#-Code)

The problem is that for the SimPart object I need some tools to be open in order to work. In my later code I do not really need workSimpart so my question is: Is there an alternative way of constructing a unit object without a SimPart-object?

thx in advance!