Column width is a property of the entire column so you cannot change wdiths
part way down.
You can merge cells if just for display and printing only.
Merged cells can cause no end of problems if you need to sort, copy and
paste, filter or a host of other functions.
BUT if only for print or display..........use them.
Or place bottom half of data on another sheet, adjust width to suit then
take a picture of it and paste to bottom half of first sheet.
Gord Dibben MS Excel MVP