If your original manuscript is on a doc file or any word processing software, a simple copy-paste on StreetLib Write is sufficient, the later will recognize the table, recreating it in the ePub code.
If you are starting from a PDF, the table has to be built manually, using the correspondent function in the horizontal tool bar.
Clicking on Table, a drop down menu will open, and you'll be able to click on "insert table"
StreetLib Write gives you the possibility to customize the appearence of your own tables ( e.g. change the background color of the entire table or single cells). For the time being, this can only be done directly in the source code.
When your table are particularly complex, both graphically and stylistically, we recommend you transform them into an image and edit it accordingly, as long as this has no significant effect on the final result.