Merging and Splitting Cells on Omnigraffle

I have a table in a document and I really cannot find a way to split cells. This seems like a really basic thing to do, yet I cannot find how to do it. Any insights ?

You are hoping to:

  • replace one cell with two (of half height or half width) ?
  • replace two cells with one (of double height or width) ?

OmniGraffle table objects are simple M * N grids of cells. In which all rows have the same width, and all columns the same height. (As measured in number of cells).

What you could do is to delete one or more cells, and place half-size or double-size shapes in the gaps.