Hi,
There is probably an easy solution to this but I don't know where to get started.
I have one spreadsheet, a sheet containing all sales for the year, with a column containing about 50,000 cells of data, they are customer IDs in sales transactions.
In the other spreadsheet I have a master customer file, sorted by customer ID.
I want to create a formula that would display an X (anything I could use to do a "sort") next to the customer ID in the master customer file if their customer ID is shown in the sales for the year spreadsheet. Basically, I want an X next to their name if they made a sale.
Any suggestions?
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