Basically, you would create an Object in Object Designer within the Problem Module, call this Object something relevant. Oh, of course this is all done in a development environment, not production first! This Object will have some basic items and you can create additional fields as you like. Then go to Window Designer, find the object you created in Object Designer, build the window how you would like. You can then go to Process Manager and add it onto a status or in the process.
This is a very basic and general overview of how to build the collection/object, so what you may need may differ. One thing I will offer is to make sure what you build, you think how this might be used in the future. Try not to corner yourself or prevent further buildout if needed.
I hope this helps.