Can I set up mapping to create a totalizer in my unit?

Yes, you can create a totalizer in mapping of the HI 3000 or HI 4000 series units..  This is a logic excersize, but to make it easier, we have created one to give you an idea of how to do this and attached to this answer.

The logic involved is the same regardless of which of the HI 3000 or HI 4000 units you are using.