I have a large amount of data that changes weekly. What I would like to do is see what has changed quickly. The older information is on one tab and the new information is on another; they are both on the same spreadsheet. How do I check to see what numbers have remained the same and what have changed? And can the result be input into the column next to the new numbers? Such as "New" and "Existing". I hope this makes sense, as I cannot show my spreadsheet due to proprietary reasons.