title: Add new Shipping carrier under Shipping tab
body: <p>I Have a requirement to add new Shipping carrier under Shipping Carrier under Salesorder>Shipping tab>
  currently I could see only UPS &amp; FedEs/More. I need to add one more carrier .How to do this?</p>
  
  <p><img src="https://i.stack.imgur.com/C6ye6.png" alt="enter image description here"></p>
  
  <p>There is a option to add carrier account by Setup> Accounting>Shipping
  How can this help in adding new value in Shipping Carrier list?
  <img src="https://i.stack.imgur.com/WMFO4.png" alt="enter image description here"></p>