> Sorry for the late follow up. I think the function you'll want to use in your formula is Switch(), which you can look up in VBA Help.
>
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> >> >> >
> >> >> > Ruthann
In that case, you'd put a formula on the Mileage field's control that uses Switch, e.g.:
Switch(Left([YourFieldName], 3) = "<01", 2.73, Left([YourFieldName], 3) = "<02", 6.0)
I'll leave it to you to fill in as many other terms for Switch as you need.

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Sue Mosher, Outlook MVP
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> The value of the selection would appear in another field, let's say the
> 'mileage' field. Perhaps I am going about it in the wrong way.
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>>
>> What I'm still vague on is *where* you want this value to appear -- the value that depends on the user's selection in the combo box.
>>
>> > EXACTLY - I have already calculated what I need - variables will only change
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>> >> >> >
>> >> >> > Ruthann