Is it possible to specify a sources folder in a Visual Studio project?

I am comming from the Java world where I usually worked with Eclipse and IntelliJ. Both IDE's allowed one to specify a folder in the project directory to be the root folder for my sources. Typically this was a folder named "src" or "source". In Visual Studio 2010 I found an option on the 'Build' tab of the project properties screen that allows me to change the output directory but I was not able to find something for the 'input' directory. Is it possible to define such an 'input' directory?