There is no built-in VBA function named STEALTH to suppress formula error messages. However, there are several approaches to achieve this functionality:

1. IFERROR Function:

This is the most common method. The IFERROR function checks for errors and returns a custom value (e.g., blank "") if an error occurs, otherwise it returns the original formula result.

```vba
=IFERROR(YourFormula, "") ' Replace "YourFormula" with your actual formula
```

2. Application.EnableEvents:

You can temporarily disable event handling, which includes error messages, while your VBA code executes a formula. Then, re-enable events after the formula is evaluated.

```vba
Sub SuppressErrorExample()

Application.EnableEvents = False ' Disable events

' Your VBA code to enter or modify formula here

Application.EnableEvents = True ' Re-enable events

End Sub
```

3. Error Handling with On Error GoTo:

This approach uses error handling to trap and handle errors gracefully. You can define a specific routine to execute when an error occurs, potentially suppressing the message or handling it silently.

```vba
Sub SuppressErrorExample()

On Error GoTo ErrorHandler ' Define error handling routine

' Your VBA code to enter or modify formula here

Exit Sub ' Exit normally if no error

ErrorHandler:
' Code to handle the error (e.g., clear cell value or resume execution)

End Sub
```

Remember, it's generally better to identify and fix the root cause of the formula errors instead of simply suppressing them. However, these methods can be helpful in specific scenarios where you need to control how errors are displayed within your VBA code.