Microsoft Word 2010: Assigning a KEYBOARD shortcut for deleting one line of text

Macro-based shortcut

OK, based on our comment discussion here's a macro based solution.

1. Create a new Macro with the following code (Alt+F8, specify the name, click Create):

   Selection.HomeKey Unit:=wdLine 
   Selection.EndKey Unit:=wdLine, Extend:=wdExtend 
   Selection.Delete Unit:=wdCharacter, Count:=1
   

2. Assign a keyboard shortcut to it:

   • File > Option > Customize Ribbon
   • Click on Keyboard shortcuts: Customize (bottom left)
   • Scroll down the Categories list and select Macros, choose your new macro
   • Press the shortcut key combination (e.g. Ctrl+D)
   • Click Assign
   • Close > OK

And you are done. Now you can press Ctrl+D whenever your cursor is on a line and it will perform Home - Shift+End - Delete sequence for you which will delete the line.

Hopefully, that will work for you. Cheers!

(Initial) Answer that uses a mouse click

If by "row" you mean a line of text then the simplest way (I think) is to click in the left margin on the line you want to delete and hit Del key. If you want to avoid using the mouse then I'd go for the approach suggested by @SoftArtisans.