Assuming your data is in A1:B1000....
Try (in adjacent column):
=OFFSET((A$1:A$1000),MAX(ROW(A$1:A$1000))-ROW(),0)
This formula is an array formula and must be confirmed with CTRL+SHIFT+ENTER not just ENTER. You'll see { } brackets appear around the formula....then you can copy it down 1000 rows and over 1 column....
adjust ranges to suit....
If you want to replace your original data after...then copy these 2 new columns, click on cell A1 (or top left cell of original range) and go to Edit|Paste Special and select Values. Click Ok... Now you can delete the columns with the formulas.
Bookmarks