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Add custom instructions (Behavior)

Assign a specific role to the AI within the GPT functions in the workbook, defining its field of expertise and guiding how it responds.

  1. In the GPT for Excel sidebar, open the Settings dropdown.

  2. Select Write custom behavior and enter your own custom instructions, or choose a predefined option from the dropdown.


    When you select an option from the dropdown, you can modify the predefined instructions.

    Choose Custom behavior in the dropdown to create your own behavior description

All GPT functions within your workbook will be executed with your custom instructions. If you refresh existing GPT formulas, the output will take this new parameter into account.

What's next

Select other settings to customize how the language model operates.