Nikon D6 Reference Manual page 357

A
Removing Opening or Closing Footage
•
To remove only the closing footage from a movie, choose [End point] in
Step 4, select the closing frame, and proceed to Step 7 without pressing
the g ( h / Q ) button in Step 6.
•
To remove only the opening footage, proceed to Step 7 without
pressing the g ( h / Q ) button in Step 6.
A
The Retouch Menu [Trim Movie] Option
Movies can also be edited using the [Trim movie] item in the retouch
menu.
305
Editing Movies