Modify the table as needed. When you are done, click outside of the table to close it.
Return to the drawing
window, and click Rebuild 
to see the updated table.
Double-click the design table in the drawing. The model opens in its own window, and the design table opens for editing.
Modify the table as needed. When you are done, click outside of the table to close it.
Return to the drawing
window, and click Rebuild to see the updated table.