Combine multiple project into single folder

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C#

Visual-Studio

Microsoft

C++11

I am using Visual Studio 2015. I have created a solution, this solution has multiple projects.
Each project has a seperate directory and current project directory structure as follows:

Main_Project_Folder
       Application1  // c++ project folder
       Application2  // c++ project folder
       CommonApplication // c++ project folder
       Client1  // c++ project folder
       Client2  // c++ project folder
       CommonClient // c# project folder
       GTestFrameWork // GtestFrameWorkDirectory folder
       UnitTest // c++ unit test project folder
       Project.sln  // Project solution file

Types Of Project:
1- Actual application projects: Application1, Application2, CommonApplication
2- Test projects: Client1 , Client2, CommonClient
3- Unit Testing projects: GTestFrameWork, UnitTest

Every c++ project folder contained the c++, header files, vcxproj, vcxproj.filter and vcxproj.user files and every c# project folder contains WPF and c# files.

I want to combine these multiple folders into the common 3 folders. SO that my directory structure are as follows:

Main_Project_Folder
       Actual application_projects
              Application1  // c++ project folder
              Application2  // c++ project folder
              CommonApplication // c++ project folder
       Test_projects
              Client1  // c++ project folder
              Client2  // c++ project folder
              CommonClient // c# project folder
       Unit_Testing_projects
              GTestFrameWork // GtestFrameWorkDirectory folder
              UnitTest // c++ unit test project folder
       Project.sln  // Project solution file

I am not sure whether it is possible or not. If possible then suggest to me how to do this?

What I have tried:

I tried to do it manually but VS2015 is not able to find the vcxproj files for building the solution.