I have a Test Studio project that is very large.  My project currently has 6 main folders.  I took each of these folders and created a separate Test Studio project.  I thought that if I could separate them it, this would be easier to manage individually and together.  I was thinking something like Visual Studio Solution file and Project File.  

For each project, I know that there is a Project File created when exported to Visual Studio.  I exported all projects to VS to get the Project File.  Then I created a new Test Studio project to house all of the tests in 1 main project.  I then exported this main project to Visual Studio.  

I then tried to add each existing project file, but this probably caused my tests to loaded twice because it took a while to fully load.  

Originally, I had a folder to hold all of my helper tests which were reusable tests like login and common functionality.  When I split my projects, I had to copy this folder to each individual project.  

I think the ability to create sub projects in effort would remove some duplication in loading folders from each project and to load elements twice.

Just a thought for functional change.