I am testing with Nintex Form, I want to know whether it can build a customized SharePoint List form with a drop down to select content type, the default SharePoint List form is able to do that.
Hello Keith Lau - As the article from Fernando Hunth noted above, Nintex Forms for Office 365 does allow you to select which Content Type your form is associated to if you have multiple content types in the same list or library. However, it does not have the "Change Content Type" control that is available in Nintex Forms 2013 / 2016. I believe this is what you were looking for. I would like to see this feature as well.
We can post this request on the Nintex User Voice site:
4 - Nintex Forms for Office 365: Hot (106 ideas) – Customer Feedback for Nintex
Take a look at this >>> Working with multiple content types using Nintex Forms for Office 365
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