Presume your "next sheet" is Sheet2, with company names in row1 across,
products listed in row2 down

In Sheet1,
Put in B2:
= --(COUNTIF(OFFSET(Sheet2!$A:$A,,MATCH(B$1,Sheet2!$1: $1,0)-1),$A2)0)
Copy B2 across/fill down to last row of data in col A
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Max
Singapore
http://savefile.com/projects/236895
xdemechanik
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"widman" wrote:
I have a list of 6000 products in column A of sheet 1of a workbook. In the
next sheet I have a column of those 50 products company X uses, 130 products
that company Y uses, etc.
If I add the column headings for each company to sheet 1, how can I bring to
that column something (like the number "1") if that product is used by the
company in that column?