Grouping Worksheets Manually
To use the Group feature manually, simply click the sheet into which you will be entering the data, and press the Ctrl key while clicking the Name tabs of the worksheets where you want the data to go. When you enter data into any cells on your worksheet, they will be entered automatically in the other grouped worksheets. Mission accomplished.
To ungroup your worksheets, either select one worksheet that is not part of the group, right-click any Name tab and select Ungroup Sheets, or Ctrl/click the sheets you added to the group.
When your worksheets are grouped together, you can look up to the title bar and see the word Group in square brackets. This lets you knowyour worksheets are still grouped. Unless you have eagle eyes and a mind like a steel trap, however, it is highly likely that you won't notice this or that you'll forget you have your worksheets grouped. For this reason, we gently suggest you ungroup your sheets as soon as you finish doing what you need to do.
Although this method is easy, it means you need to remember to group and ungroup your sheets as needed or else you will inadvertently overtype data from another worksheet. For example, you might want the simultaneous entries to occur only when you are in a particular range of cells. However, simultaneous data entries will occur regardless of the cell you are in at the time.