what do you mean by:
Personal folder structure ?
I suppose that you want to divide apps in two or more categories in one single stream.
for doing this, take a look a this very detailed step-by-step video:
here you can find how to give access to a group of users some applications and to another group of users some other applications, in a single stream.
Now, suppose, I have created 5 applications, one related to Finance, other w.r.t. HR and like wise.
Now each application is in work folder.
While doing number of POCs I have created versions of same, say 4-5 versions of each app.
Now, if one day, I just want to work for HR versions, in that case, I want to just go to the HR folder in my work stream and work accordingly.