Open the Tools menu and select Track Changes, Accept or Reject Changes.
Excel notifies you that the workbook will be saved; click OK. (If you have already saved your changes to the workbook, you won't get this message.)
The Select Changes to Accept or Reject dialog box opens. Click OK to accept the default options.
Excel locates the first changed cell in your worksheet. To accept the change, click Accept; to reject it, click Reject. When you're finished, click Close.
INTRODUCTION
When you are ready to finalize a worksheet containing tracked changes, you must determine which changes you want to keep, or accept, and which you want to reject. When you reject a change, Excel restores the cell to its previous value.
TIP
Accepting or Rejecting All Changes
To accept all the changes made to your workbook in one fell swoop, click the Accept All button in the Accept or Reject Changes dialog box. To reject all the changes, click the Reject All button.