Select
an object or character that is constrained or is animated by an expression
from the scene view or from the Current Character Set drop-down
list.
In
the Trax menu bar, select either Create > Constraint
Clip or Create > Expression Clip.
If the character has any constraint channels,
then a constraint clip is created
for those channels.
If the character has any expression channels,
then an expression clip is created for those channels.