It is a common problem. You have Multiple spreadsheets, and you need to move data from one column to another, but not every item needs to be copied. As long as you have a unique data point (Item number, membership ID, email, etc) that is in both spreadsheets, I can move your entire data set from one spreadsheet to the other by doing a V-Lookup.
I have been working in Excel for over 15 years, and perform these types of database functions daily.
Basic gig includes up to three spreadsheets merged. See gig extras if you have need of more than three spreadsheets. Spreadsheets with multiple tabs should be counted as individual spreadsheets