Craig,

Since all the sheets have order records, you will likely find it much better
to put all of your orders in one sheet with a date column added. Read "Data
across multiple sheets" at http://www.smokeylake.com/excel/excel_truths.htm.
In this case, finding any record will be straightforward with filters and
other tools. If there are too many orders for a sheet, you'll likely need
to use a database program like Access.
--
Earl Kiosterud
www.smokeylake.com

"Craig" wrote in message
...
I have an Excel workbook (call it Workbook A) with one worksheet for every
day of the year since July 1, each containing, among other things, a list
of
order numbers for that day.

In another workbook (Workbook B), I have a smaller list of order numbers.

What I would like to do is write some kind of function in Workbook B so
that, for each order number in the smaller list, it will look for that
same
order number in Workbook A (it could be in any worksheet in Workbook A)
and
return the name of the worksheet -- the date for the order.

Does such a function exist?

Many thanks for any help.