Actually, all of the data is in one sheet. It's hard to do this without showing someone what I'm trying to do but basically, I have a spreadsheet that provides individual historical entries on a group of files in my office. Each row is comprised of a File number, Date Stamp and Time Stamp. So, basically, for John Smith's file, there would be several rows containing the forgoing information.
I have a list of new file numbers that I need to add as a new column and I have a translation table that allows me to determine which new file number goes to each entry. To make matters worse, some of the history entries do not have a new file number. Basically, I want to assign the new files numbers to the entries.
Thanks.