This is not something we currently support but you can add or vote on feature ideas:
If you need to add a new idea click "Create an idea" under "Actions" in the top right.
You could set up something like this in the response table, through the use of formulas. A formula is defined whenever the first character of the input is "=" (an equal sign). If you provide more information on your form we can help you to set up the correct formula.