Excel Changing cell value based on another cell, but not always

Is there any way to have a cell change its value based on another cell, but also be able to enter a cell value if the first cell had nothing in it without wiping out a formula?

Ex:

If Cell A1 has a value of 1
I want Cell B1 to have a value of 1 automatically.

But if Cell A1 has no value,
I want Cell B1 to be able to have a value put in without overwriting the formula.

Is that at all possible? Perhaps by having a formula in another cell, say C1, that is monitoring the value of A1, and if it has a value, place that value in B1?

Thanks.
repcoAsked:
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[ fanpages ]Connect With a Mentor IT Services ConsultantCommented:
Hi,

A single cell can have either an explicit value (such as a number, text, or a date), or a value derived from the presence of a formula.

It cannot have both a value & a formula (unless the value is the result of the formula).

That is, it cannot have both one value & a formula that results in another value.

However, Visual Basic for Applications [VBA] code can be introduced into your workbook so that whenever another cell's value changes, the value of cell [B1] can change to suit your needs.

This could be either an explicit value, or a value derived from a formula (but not both at once).

The VBA code within the Worksheet_Change() event would determine what [B1] contained.

Please advise if you would wish to see a demonstrate of this.  If possible, could you attach (upload) your existing workbook so that the necessary code can be added to this directly (& then re-attached for you to download)?

BFN,

fp.
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sentnerConnect With a Mentor Commented:
Easiest way would probably be to have another cell contain the data for the default.

For example, setting B1 to:

=if(A1=1,1,C1)

This would put a 1 if A1=1, otherwise it'd use the value of C1.
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repcoAuthor Commented:
Thanks for the input. In the end, I'll just have to change the way the form works as I cannot use VBA, nor does it have a default value. VBA will work though, so I'll give you points for that.
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frankhelkConnect With a Mentor Commented:
A simple way for that would be the use of an intermediate cell for that.

Imagine A1 is your "input" cell, which could contain an value or be empty.
Cell A2 (which supplies the value to subsequent formulas) could contain a formula like this:

=IF(A1="";(formula);A1)

or

=IF(ISEMPTY(A1);(formula);A1)

That way the value of A1 is supplied to the subsequent formula if it is present, and the formula result if A1 is empty.
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