# Revision It is normal for customers to update or revise subscriptions they have paid for. Revision can be related to plans, number of users or price range. In such cases, Subscription and Recurring Billing Management gives provision to revise the existing subscription schedule and generate new Invoices or Sales Orders. Once revised, the invoice or sales order will be generated based on the new values stated in subscription schedules. Subscription Schedules can be revised in the following ways: * [Through Subscription Lines](https://docs.inogic.com/subscription-and-recurring-billing-management/features/revision/revise-subscriptions-through-subscription-lines) * [Through Opportunity/Quote/Order](https://docs.inogic.com/subscription-and-recurring-billing-management/features/revision/revise-subscriptions-through-opportunity-quote-order) {% hint style="success" %} For further queries, reach out to us at {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.inogic.com/subscription-and-recurring-billing-management/features/revision.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.