See the tutorial lesson on tables for a hands-on example.
You can merge table cells to create areas that span rows and columns. For example, you could create a table like this one:
Note: Merging cells deletes the contents of all the cells you merge, except the contents of the upper-left cell. To keep the contents of the other cells, cut and paste them into the upper-left cell of the set of cells you want to merge then place your cursor in that cell before choosing the TableMerge Cell menu option.