> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meteroid.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Managing Invoice Annexes

Invoice Annexes let you attach detailed appendices to your invoices, for example a full breakdown of usage events behind a usage-based charge. Annexes are managed at the Plan level, in the Invoice Annexes section of the plan configuration.

To create an annex, click Add annex > Create new, then fill in the following fields:

* Name: Internal label for the annex. Not displayed on invoices.
* Kind: Choose how the annex is rendered on the invoice:
  * Table: Displays the annex as a structured table of rows and columns (see below).
  * Static text: Displays the annex as free-form text.
* Title: The title displayed on the invoice.

Datails on annexes of kind Table:

* Event codes: The event(s) detailed in the annex. This must match the event code used when sending events to Meteroid.
* Rows: Choose how events are listed in the annex:
  * One row per event: Every event is listed individually, with no aggregation.
  * Aggregated: Events are grouped together in a single row, based on the property set in the "Aggregate by" field.
* Columns: Define one or more columns to display in the annex. For each column:
  * Label: The column header displayed on the annex.
  * Shows: What the column displays:
    * Property value: The value of a property on the row.
    * Event date: A date based on the event's timestamp.
    * Count of events: The number of events.
    * Sum of property: The sum of a numeric property across the events, based on the property set in the "property/date" field.
    * Period: The period, based on the event's timestamp.
    * Billed amount: The amount billed for the row.

💡 **Note**: You can further organize the annex by entering a property in the Group by field to group events together, and a property in the Sort by field to control the order in which they appear.