virtualbox.org

I am looking to create a virtual USB drive that I can attach to my virtual Windows machine. The purpose (as a PC technician) is to create and test a USB drive that has multiple O.S. ISO's as well as testing and repair software. I would prefer to test this out in a virtual environment and determine the appropriate size drive I will need (so I will be setting up the drive space dynamically) before Physically creating the actual USB drive.

unless I am missing something in the forums (if I am, I apologize, and will be happy to be directed to the thread I missed)

Go to Storage settings and add a USB controller.