Hi,
Is there a way I can call an expression rule inside a process model and save different values from the expression rule output to the pv! variables for further use.
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In the script node output, you can call your expression rule by using rule![your_rule_Name} in expression mode. In the target use the variable in which you want to save the value.
I really don't mean to seem dismissive, but this is pretty standard / basic functionality. Out of curiosity, did you complete the online training courses? If not, they should provide you much of this information.