Index-match with dynamic criteria

[drluke]

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[TD="class: xl68, width: 314, colspan: 4"]I am using CHOOSE to select a formula based on a criteria:[/TD]
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[TD="class: xl69"]SHEET 1[/TD]
[TD="class: xl69"]SHEET 2[/TD]
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[TD="class: xl68"]A1=1[/TD]
[TD="class: xl68"]A1=1[/TD]
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[TD="class: xl68"]A2=DR289[/TD]
[TD="class: xl68, colspan: 8"]B1= INDEX-MATCH Formula =INDEX('Sheet3'!$A$1:$D$100,MATCH('Sheet1'!A2,'Sheet3'!$A$1:$A$100,0),4)[/TD]
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[TD="class: xl68"]A3=DR783[/TD]
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[TD="class: xl68, colspan: 13"]In Sheet 1 at B2 I have my CHOOSE formula: =CHOOSE($A$1,'Sheet2'!B1,C1,D1). My problem is that when I copy the formula down to he next line I get the same result as above [/TD]
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[TD="class: xl68, colspan: 3"]because INDEX-MATCH is still matching A2.[/TD]
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[TD="class: xl68, colspan: 9"]Is there a way to make the INDEX-MATCH dynamic so that A2 changes to A3 etc when the formula is copied down? [/TD]
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[Special-K99]

In the CHOOSE formula change $A$1 to $A1