主wise buying 谓is 宾a positive way.in which you can make your money go for the way you go about purchasing作第一个way的定语,是个定语从句,in which是引导词,这个句子所修饰的第一个way是先行词.在这个定语从句中又包含着一个定语从句,是you go about purchasing,省略了引导词,作第二个way的定语,第二个way是先行词.