Probably what you're missing is the Debug toolbar in your VBA editor
window.
(Right-click in the icon area and select "Debug".
The standard icons for this toolbar include those
for commenting and "un-commenting" selected rows (you just have to have
the type-in bar or any portion of the row selected)
as well as indenting and stepping through code  (which is REAL handy
instead of using debug.print and msgboxes)

To select the entire line to delete, move the mouse all the way to
the left of the line. The pointer changes to an arrow pointing to
the right (at least on mine). Selecting hightlights the line. Delete
or Backspace removes it.

As for drag and drop, you may have to turn it on from Tools-Options (in
the VBA editor).
Also, consider customizing you colors to help you read your code!

I think spending time with this editor  and "customizing" it where you
can will be much more valuable than exporting the code and importing it
before you can test it...