The maximum number of rows in the RichEditControl table is 32767, the maximum number of columns is 63. If an end-user enters the number of rows or columns that exceed the limit, an error icon appears, as shown below.
Also, you can programmatically insert a new table into the document. To do this, call the TableCollection.Create API method.
The Insert Cells dialog enables end-users to insert a cell into the existing table and select the way to adjust table cells.
End-users can invoke this dialog by clicking Insert Cells on the Table Tools | Layout ribbon tab...
...or from the context menu by selecting Insert > Insert Cells.