From the left side navigation pane in any version of TDX, first select References>DOT Proper Shipping Name and find a shipping name similar to the new name that you would like to create. Select the "Copy" icon from the top right on the screen. This creates a copy of the selected shipping name for editing. Make any edits and save by clicking on the green arrow.
Note: The first form entry under the label "DOT Shipping Name" is the text that you will see in the shipping document drop down form. The second form entry under the label "DOT Shipping Name" is the actual shipping name that will print to your shipping document.