Just drag it from one track to another.
If you position the playhead at the beginning of the clip, you can use it to help line up the clip at the exact same time spot on the timeline.
when i drag the clip, sometime, it moved to left or rigt...
is there any key (like ctrl or alt) that keep it's sitting ?
Have you tried my trick with the playhead?
no, please explain your meaninng
Put the playhead (Current Time Indicator) on one end of the clip you are moving. Then move the clip to another track and let it snap to it.
i look for other triks...
There are some programs with tools that help.
for example: if there is 2 clips, one behind the another,
but not begin at the same point,
i can mark them both and order the computer application
to order them exactly like the first...
or, mark the two and make the length of them exactly like the longest...