I'd like to know if it's possible, either in Zoho CRM or Zoho Invoice, to custom some sliding scale tariff for a monthly billing process.

We've investigate how to set it :

- first on a single account, based on its yearly consumption, 

- then for a groupe of customer, based on the # of subscribers.

First support we've got from one of Zoho partner were inconclusive.

If there is a simple solution to this issue, I'd appreciate it a lot.

Many thanks in advance,

Thierry