Select a biped. > Motion panel > Biped rollout > Load File (in Figure Mode)
Select a biped. > Motion panel > Biped rollout > Save File (in Figure Mode)
Figure files save all information about a biped's anatomy: links, link positions, twist links, and Figure mode posture, and the scale of geometric elements. Figure (FIG) files have a .fig file name extension.
Figure files do not contain the actual biped skeleton, or any animation. They are used strictly for setting or saving a biped's pose in Figure mode.
Figure files are useful for quickly setting poses for similar or identical characters.
Clicking Load File brings the Open dialog, from which you can pick a FIG file and choose from the following twist poses options:
Load Twist Poses: Loads both the twist links and twist poses data. (Default=on).
Load Twist Poses Only: Loads only the twist poses data without the twist links.
Note: The Twist and Bias values are not used without twist links. Refer to the Twist Poses rollout for details.

To load a biped figure:
Warning: Loading a figure file replaces the selected biped's pose and base parameters. If you have created a new pose or a new biped structure, save it in a figure file before you load a different biped figure.