disable fee in order

[thanbaib2]

Hi All,
I am going to build a website, that sales pin-code
actualy, I did it work, but some thing wrong in calculation the total order
here is the picture I want to show you


In this picture, I dont want to add fee, so I expect totalorder = suborder = 3000

But I dont know where I can fix it?
somebody help me
many thanks for reading my topic
I hope can find the solution as soon as possible