If your character's joints are named according to the HumanIK naming conventions (listed in the Name Match view), you can apply the HIK naming template to automatically complete the mapping process.
To define a skeleton using the HIK naming template
This file can be found in the GettingStarted2020LessonData\HumanIK directory that you set as your Maya project.
A character named Sven appears in the Maya scene.
This creates a new character (named Character1 by default) and opens the Definition tab.
The Load Skeleton Definition dialog box opens.
Make sure this option is selected and QuickRigCharacter_ is entered as the prefix.
The template is applied and Sven's skeleton definition is valid.
Note that all of Sven's nodes have been matched based on the HumanIK naming conventions. Sven's joints use the same joint names as those listed in the Name Match view.