The Mixer Clip Source Options dialog opens when you select one or more clips on a track and choose Load Source 
From File Clips menu. The new clip you choose replaces the selected clips. You also have the option of replacing instances and adaptations of selected clips.
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Select a biped. >
Motion panel > Biped Apps rollout > Mixer > Select clips. > Motion Mixer dialog > Clips > Load Source > From File
Interface
- Load Animation Into:
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- The selected clips only Replaces only the selected clip with the newly specified clip.
- All instances of the selected clip Replaces instances of the clip (any occurrence of the selected clip within tracks for the same biped, or other bipeds of the same size).
- All instances and adaptations of the selected clip Replaces adaptations (any occurrence of the selected clip on all bipeds' tracks).
- Method to Fit Animation to Clip:
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- Scale animation to fit clip Scales the length of the loaded clip to match the length of the clip it replaces in the track.
- Trim animation to fit clip Trims the length of the loaded clip to match the length of the clip it replaces in the track.
- Set clip length to animation length, shifting remaining clips in time For selected clips, changes the animation length to the loaded clip length. All clips on the track after the selected clip are shifted depending on the length of the newly loaded clip.
- Remove Weights
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Removes any existing weight curves from clips selected to be replaced.
- Remove Warps
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Removes any existing time warps from clips selected to be replaced.