Mark-In or Mark-Out a Clip Mark-in a clip to remove time from the beginning or end of a clip. The mark-in option differs from the Cut Selection option in that the mark-in option hides a portion of the clip instead of cutting it. 1. Click to select a clip on the Timeline. Triangles appear on the beginning or end of the clip. 2. Place your cursor over the beginning or end of the clip. 3. A handle appears. Click and drag the handle to mark-in or mark-out the clip.