Help creating a word macro

[Makingwork]

Hi everyone,

I am using a drop down content control box with 3 values (A, B, C).
Then I have a Date Control Control Box.
Then I have a blank space that says "Review on ____(date)"
I want to fill in the blank.

Would someone be able to help me write a script that says something like:


If Down Down Box = A, then take the "date" + 3 years, If = B then date +2 years, and if C then date = 3 years.
otherwise do nothing?

How do I go about doing this? I do not know how to code, and I'm hoping someone can help.
Is there an easier way to do it?

Thank you so much in advance!