Click the View tab then Styles.
In there you will see a drop-down to select the type of style you want to modify (Dimension, Table, Text, Fill etc)
If you want to create a new text style for your table this is where you do it.
Then select Table style from the drop-down and you can create a new table style or modify an existing one. You can set different text and line styles etc.
Its a bit tedious doing it this way, but in ST4 I think its all configurable in the table properties command.