Can someone else see my replies below and help on the case please. 

Hi Shreya, Thankyou for your rersonse.  I have done the steps and It seems you did not get my question, what I am trying to say is that lets say if a customer is taking COD(means already bypassing paymemt gateway), then how I can charge the customer ...

Hi, I want to charge a fix shiping fee upfront on all my COD orders, please let me know how it is possible within shopify without adding an addtional application. 

Moharsh.in what I want to do is, I want to give my customer options to click on a direct button on the top, wich takes them to a refreshed page  with filtered options. Like M L XL XXL - Four buttons and upon selecting the button the page should show ...

Hi Please give coding with option to redirect the button to a diff page , thanks