4
As you make a topic in CBB you have the option to add a poll or to just post a topic.
with this you must have the poll's module installed for it to work.
If i read correctly, you need one to add a poll when ever and where ever in the topic, this as i know of hasnt happened yet in CBB, but if you ask
Xoops Forge they might beable to hack or add a option for you.