If you mean "row data" into "columnar data", highlight the row of data,
select COPY, click on the target cell then EDIT > PASTE SPECIAL > Transpose >
OK.
If you data is in range C5:C9 and you want to transpose this to F5:J5, you
can use the transpose() array formula. Highlight F5:J5 and type
=transpose(C5:C9) and now press Ctrl+Shift+Enter.