Nikon D780 Reference Manual page 319

3
Select [Choose start/end
point].
Press the i button, then highlight
[Choose start/end point] and press
2 .
4
Choose the start point.
To create a copy that begins from the
current frame, highlight [Start point]
and press J . The frames before the
current frame will be removed when
you save the copy in Step 10.
Options for Movie Recording and Editing
273