Say I have a row of values, I select them and I create a column chart. The
names of the values on the horizontal axis (i.e. the name of each category)
will be, since I did not provide data for them, integers: 1, 2, 3, ...

Is there a simple way to rename each category (for example, have "Costs"
instead of "1" etc), without having to create cells that have those names and
then recreate the chart including those cells?

Thanks.