In some situations, you can't work with a workbook that consists of merged cells. To use Filter,
Sort, or other functions, you need to unmerge cells and put to all of them the data from merged
cells. This tip shows how to do it efficiently.
Formulas can refer to cells in other worksheets-and the worksheets don't even have to be in the same
workbook. Excel uses a special type of notation to handle these types of references.
You can enter nonrelative references (absolute or mixed) manually by inserting dollar signs in the
appropriate positions, or you can use a handy shortcut - F4 key.