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you should be able to achieve what you need using the Formula tool. You can find it in the blue "Preparation" category on the top ribbon in Designer.
The Formula tool allows you to change existing fields with values coming from another field, which should address your 1st rule.
You can also build "IF-THEN-ELSE" statements to address your second rule. You can find the syntax of this statement by clicking on the blue 'fx' button > Conditional within the configuration of the Formula tool, after you've placed it on the canvas in your workflow.
You can use the Left([Field], 2) function to test the first 2 characters of your field.
Finally, if you left click on the Formula tool on the ribbon (not in the actual workflow) > Open example, you should be able to see multiple configurations of this tool and learn it from there.