To bill clients annually, you start with the most recent monthly charge, export the details, then multiply the amount by 11 to cover the remainder of the year. You then import these as bulk custom charges.
Steps to follow
Upload the monthly vendor invoice as usual.
Complete the customer mapping for all charges.
Go to the Charges page and export the charges that you want to annualise.
In your CSV, multiply the amounts by 11 to cover the remainder of the year.
Go to Imports > Custom CSV Import.
Use the Rechargly CSV template and follow the instructions to complete your bulk import