Depends on where you have your formula placed. If you have it, for instance, in the AfterUpdate events of textboxes that hold data used in the formulas, yes, you can enter another figure if you like, just like you can if you have a Default Value for a control and want to change it. If, on the other hand, your formula resides in the Control Source for the textbox, then no, you can't.
Perhaps if you'd tell us a little more about what you're trying to do we could give you more pointed advice.
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