EVP Office only charges for each evaluation of a particular security on a particular date for each portfolio.
This means that if you add a security to an already-evaluated portfolio and re-evaluate, you’ll only charged for the new security.
If you change the evaluation date and re-evaluate, you’ll be charged for each security, as they’re all being priced anew.
If you create an entirely new portfolio and re-enter the same securities and a date you used in the original evaluation, and evaluate, you’ll be changed fo reach security, as this is a new portfolio.