Character > Create Subcharacter Set >
Specifies which attributes will be included with the subcharacter set as keyable. You can choose All Keyable, From Channel Box, or All Keyable Except.
Specifies whether certain attributes will be included with the character set. This allows you to control the number of attributes included in a character set as you create the character set. This can save you time, reduce the number of attributes listed in the Channel Box, and help make your animation work more efficient.