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

# Make a precise change with Ari

> Have Ari change one assumption, formula, or table and leave everything else alone: name the target, fence off what must not move, try risky changes in a Scenario, review what changed, and undo it.

Use this when you want one targeted change, such as a new price, a later start date for two hires, or a fix to one formula, and nothing else touched. Ari does not ask before it changes the Model, because every change can be undone, so a precise request is the best way to get a precise result.

**1. Point at what should change**

Mention the exact cell, row, or table. Right-click a cell and choose **Mention cell in chat**, right-click a row or column label and choose **Mention in chat**, or open a table's block menu and choose **Mention table in chat**. Or select a cell or a table and press **⌘ L** (**Ctrl L** on Windows and Linux). Ari then edits that place instead of guessing which one you meant. You can also name it: "the Price assumption on the Revenue Page" is clearer than "the price".

Customers often call the inputs of a forecast "assumptions". In cfo.ai each one is a Variable or a value in a Table block, and you can name it either way.

**2. Say what to change, and what to leave alone**

State the change and fence off everything else in the same message:

> Change the Starter plan price to \$49 from January. Only change that price. Leave the other plans, the dashboard, and the table layout as they are.

> Move the start dates of the two Q1 engineering hires to April. Don't change salaries or any other hire.

> Fix the formula for Gross margin in the Downside Scenario only. Don't rename anything and don't add Pages.

**3. For a risky change, work in a Scenario**

If you are not sure you want the change, have Ari make it in a Scenario, so Main, your plan, stays as it is until you decide:

> Create a Scenario called Price test, change the Starter price to \$49 there, and compare cash with Main.

See [Test a decision in a Scenario](/guides/test-a-decision-in-a-scenario.md).

**4. For a large change, ask for the plan first**

Before a change that touches many tables, ask Ari to show its plan before it changes anything:

> Before you change anything, show me your plan for restructuring the expense tables.

Ari shows a plan card. Read what it will create and the assumptions it will use, change any that are wrong, and select **Build it**, or select **Make changes** to describe what to do differently. See [Answer Ari's questions and approve its actions](/guides/approve-ari-actions.md#approve-a-plan).

**5. Review what changed**

While Ari works, each edit plays on the Page with a caption showing the old and new value, such as `5% → 4%`. When it finishes, ask:

> What exactly did you change? List every table, formula, and value.

Every change is also listed in version history, newest first, with who made it. See [Chat controls and messages](/reference/chat.md#edits-playing-on-the-page) for what the captions and cards show.

## Take a change back

If Ari changed more than you wanted, ask:

> Undo that last change.

Ari undoes the most recent change as a whole. To undo an older change, describe it, such as "Undo the change to the hiring plan from this morning," or undo it in version history. See [Undo a change or restore an earlier version](/guides/undo-changes.md).

## If Ari keeps changing things you did not ask for

* Stop it as soon as you see it: select **Stop**, then say what to leave alone. See [Steer, stop, or add to Ari's work](/guides/steer-ari.md).
* Make the fence part of the request every time, such as "Only change X" or "Work in the Price test Scenario only".
* Ask Ari to remember a lasting preference, such as "Never rename Variables without asking", so it carries the preference into later chats. See [Teach Ari your company's conventions](/guides/teach-ari.md).

## Make the change yourself

To change a value or formula by hand, see [Enter, paste, and clear values](/guides/enter-values.md) and [Write a formula](/guides/write-a-formula.md).

## Related

* [How Ari works with you](/concepts/working-with-ari.md)
* [Ask Ari about a number](/guides/ask-about-a-number.md)
* [Have Ari write, change, or explain formulas](/guides/change-formulas-with-ari.md)
* [Review Ari's formula changes](/guides/review-ari-formula-changes.md)


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