This article describes how to go from a standard table...
...to a table with individual column base sizes in the footer:
A table with rows and columns.
1. Select your table.
2. Go to Properties > RULES on the object inspector.
3. To apply the rule, select the Plus (+) > Modify Footers > Add Column Base Sizes.
4. Set the Between label and number text and the Delimiter character between columns as appropriate.
5. Press OK.