Yes. There are some exceptions with the deform tools. But for proper sheet metal tools SW adds a few features to the feature tree to allow the creation of a flat pattern. SW then allows the all the sheet metal tools to be used for bends, flanges, etc.
Wow, I too did this challenge on sheet metal. It was hard for me to figure out on what environment this has to be done. I am attaching my solution. Also in catia it is possible to make multiple bends from flat at a time. Nice challenge.