find and customize existing coder toolchain

I have an working toolchain that includes VS2013, but I need to customize it. The customization could be as simple as changing 'amd64' to 'x86', but to do that I need to find the definition file or object. Is there a way to get these? coder.make.getToolchains identifies the available toolchains, but I can't use it to find where the definitions are. Starting with the demo definition file intel_tc is just too intimidating. Please help.