Let me explain how you should approach this.
What you need is a macro that runs when you change A1, B1 or C1 of a specific spread sheet.
So you need a sheet specific macro that is triggered by a change event.
So Right click on the sheet name of the sheet in question and select view code.
A window opens there are two list boxes.
On the one on the left choose Worksheet
On the one on the right choose Change
you will have something like this:-
This will run anytime you make a change in that specific worksheet.
So any code we run will be sheet specific.
Next we need to ensure that our bit of code only runs if A1, B1 or C1 are changed.
You need a bit of code like this:-
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