1. Click Create Finance Periods on your finance book.
2. Set your finance period start date.The start date should be the first day of a month.
3. Set your number of finance periods.Salesforce Billing creates a finance period for one month starting on your finance period start date, then adds months based on the number of finance periods.
4. Set your legal entity.
5. Set your finance period’s currency.
6. Click Submit.