HowTo create a visual studio 2013 multi-project solution and add it to team foundation server express 2013 => create an empty solution in visual studio => add the folder structure and the sub projects as desired => delete the solution file => create the solution file again; this time check the checkbox "add to source control"; choose GIT as the desired version control system => connect to the team foundation server in the team explorer of VS2013 => connect to the desired Team Project Collection (if none existent, then you have to create that one first on the TFS Administration Console => say under "Team Explorer - Connect " -> Create Team Project... and create it => now, clone the repository into an empty folder => close VS, copy the solution and the structure you just created into that newly created empty folder => now make a git commit and then push to origin for the branch master (i use GitExtensions for that)