Not only is there a manual, but it's online!
The online help files for:
Vectorworks 2018 can be found here
Vectorworks 2017 can be found here
Vectorworks 2016 can be found here
Vectorworks 2015 can be found here
In the event that you do not have internet access, there is a version installed on your computer for reference too.
You can access the Help documents for your version of Vectorworks under the Help menu > Vectorworks Help
