How to write multiple functions into one *.src file In VTScade it is possible to define your own functions. Edit AppRoot.SCR where the file with functions is defined. Then in the file for example NewFunctionName.SRC you write a function. This works correctly for me if there is only one function in the file, but when you add a second one it says that you are using the used variable. You rename the variable and it ends up that the MAIN block is already defined.