hi djauncey, try this array formula:
Formula:
=IFERROR(INDEX('Product Selection'!$A$2:$A$8,SMALL(IF('Product Selection'!$B$2:$B$8=1,ROW('Product Selection'!$B$2:$B$8)-ROW('Product Selection'!$B$2)+1),ROWS(A$2:A2))),"")
...confirmed by pressing CTRL-SHIFT-ENTER to activate the array. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL-SHIFT-ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again. extend the range if needed
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