Can I provide drop down plus data entry box in same feild

I believe that you are looking for configurable list widget that allows to have different type of fields in each entry. 

Please refer to the guide below that can help you in setting up Configurable widget.

https://www.jotform.com/help/282-How-to-Set-Up-the-Configurable-List-Widget

Hope this information helps. If you are referring to something different, please let us know. We will be happy to help.