You can add or delete sheets in a workbook. If, for example, you are working on a project that requires more than three worksheets, you can insert additional sheets in one workbook rather than open multiple workbooks. You can insert as many sheets in a workbook as you want. If, on the other hand, you are using only one or two sheets in a workbook, you can delete the unused sheets to save disk space. Before you delete a sheet from a workbook, make sure you don't need the data. You cannot undo the deletion.
Insert a Worksheet
Delete a Worksheet