I do not why I cannot select "item" in the entering item option. 
The next error appears:
Flexscript Error MODEL:/Tools/ProcessFlow/OpportunityCombiner/Wait for Event~2>variables/events/1/objRef Line 5 syntax error, unexpected identifier, expecting ')' or ','Could not finish parsing because of previous errors.
Here you have the model (2022 version)
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You can select from this menu list label names that you have already used somewhere else in your process flow to assign them at tokens. If you haven't assigned label name "item", then you cannot choose it.
You can check it in a new model. You will see that this list is empty at the beginning.
By not just blindly copying words you see in another model into a field without knowing its meaning. ;-)
The object field expects that the entered value is a pointer to an object. This could be a label on a token or as in this case, the instance object. In an Object Process Flow the instance object can be accessed through the parameter name current in just about any activity. You also copied the "(No Instance)" text into the field. So now it contains both an Object variable and plain text and as a result the compiler throws an error. You can see this more clearly when you look at the code of the field.
If you only type in current, the text in the field automatically changes to this:
Note that the text has turned purple to denote that this represents a pointer value.
So why does it say "(No Instance)" after current?
The value in parentheses is supposed to let you know which instance of the Process Flow you are currently looking at. "No Instance" meaning that this is the 'master' version of the Process Flow so to speak from which the individual instances are derived.
If you open the PF view of the OppCombine object you will see that the field now shows the name of the object whose PF instance you are looking at.
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