> ## Documentation Index > Fetch the complete documentation index at: https://docs.denari.com/llms.txt > Use this file to discover all available pages before exploring further. # Billing groups > The unit that gets one invoice, and where the invoice frequency is set. **A billing group is the unit that gets one invoice.** Usually it's just "the client". A large client can be split into several billing groups if parts of the business need separate invoices. * Each [entity](/flows/clients-and-entities) belongs to one billing group. * Go to **Billing groups** to see them all. * Archiving a billing group keeps its invoices and charges. You can restore it anytime. ## Create a billing group Click **Create billing group**. You can also make one while [adding a client](/flows/clients-and-entities#add-a-client). Pick the client and the entities that belong in this group. If an entity is already in another group, Flows warns you that it will move. The name, the firm owner, the billing email, the contact name, phone, and remit-to address. Monthly, Quarterly, or Annually. ## Invoice frequency is the billing clock The invoice frequency is set here, on the billing group. The work keeps its own schedule on each service. Each invoice gathers the work periods that end inside its billing period. See [The two clocks](/flows/billing#the-two-clocks). So to bill monthly bookkeeping every quarter, set the group to **Quarterly**. The quarterly invoice gathers all three months. ## The billing group page A billing group page showing Outstanding, Draft billing, and Account credit, with Overview, Services, Invoices, Periods, and Settings tabs. At the top: what is **Outstanding**, what is in **Draft billing**, and any **Account credit**. Admins also see **Record payment** and **Create invoice**. | Tab | What's on it | | - | - | | **Overview** | Account activity: invoices, credit, credit notes, and payments, with a running balance. | | **Services** | Every service this group bills, how each is billed, its schedule, price, and budget, plus charges and the **WIP, budgets & adjustments** section. | | **Invoices** | This group's invoices. | | **Periods** | Its [billing periods](/flows/billing-periods). | | **Settings** | The group's details. | The same workspace shows up on each engagement's **Billing** tab, limited to that engagement. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.