Tables
A table is a special kind of group that organizes rows and columns of objects.
To make a table:
Create a single shape object to be the first cell of your table.
With the object selected, choose Arrange ‣ Make Table. Your object is now a 1 x 1 table.
Drag the right-side table handle to the right to add columns.
Drag the bottom table handle down to add rows.
You can also select a number of already-existing objects and then use the Make Table command; OmniGraffle rearranges the objects into rows and columns as best it can.
Table cells can be selected and edited just like group members. If you resize a cell, the rest of the cells in its row and column resize accordingly. When selecting cells, you can Shift-click to select everything between the cell you click and the last cell you selected.
You can add or remove rows or columns at any time by dragging the table handles outward or inward. Resize the table as a whole by dragging the ordinary corner handles.
There is an Edit ‣ Tables submenu which contains commands you can use when you have a table cell selected.
To disassemble a table, select it and choose Ungroup from the Arrange menu.