Go to Untilites->Max Script, and select a m3-sequence there.
There u'll need to press add, then close and run m3-sequences again to see the animation u added in the list. Then u can set start and end frames. You need to have animation keys at start and end frames of your choosen animation. Also, don't include 0 and 1 frames, they are preserved for something. And I recommend to assume, thet 1 sec of animation is 1000 frames.
@Henskelion: Go
Go to Untilites->Max Script, and select a m3-sequence there.
There u'll need to press add, then close and run m3-sequences again to see the animation u added in the list. Then u can set start and end frames. You need to have animation keys at start and end frames of your choosen animation. Also, don't include 0 and 1 frames, they are preserved for something. And I recommend to assume, thet 1 sec of animation is 1000 frames.