Besides creating a table via the table button, there is also the option of pasting in a preexisting table from a different office document. To do that simply select the respective table or a portion of it and copy it. Afterwards, you can paste that table into your SciFlow document at a favorable position.
If you require a table with merged cells, this approach can help you out as well, since importing a chart from an external program (e. g. Microsoft Office or Open Office) also preserves its original grid structure. Therefore, you can either paste in an empty grid of the necessary structure into your SciFlow document or complete the table externally altogether and eventually paste in the finished product.
Keep in mind that this method currently does not transfer text alignment and thus has to be adjusted subsequently. Also, please take note that the import of tables from Excel does not include text properties like italic or bold.