Hello @CherryHealthFoundation. At this time, we do not have the abililty to easily create nested tables within Constant Contact. While I am not sure if it is being worked on, I can most certainly put in feedback for you to our product team to see if this is something that could be put into our editor in the future.
Thanks for the reply Caitlin...I would be grateful if you would bring this up to the team. I'm sure I'm not the only one who would like the ability to use nested tables. Especially, since editing the HTML/CSS does not afford a viable solution. It jacks the table formatting around and doesn't look good at all.
You won't get nested tables from the CTCT editor ever !!
You should be able to use your own html though.
Nested tables in the small real estate that an email client on a mobile device affords is pretty challenging.
Why do you need to nest them? Certainly there are work arounds.