Hi,
Do you mean how to change the rotation direction for arms in the motion editing?
As I know, you can stretch arms by move cursor to the end first.
After that, if you move up the arms will rotation to up direction; and move down will get another direction for the arm.
Take look the image below
![BigGrin](https://forum.reallusion.com/Skins/Classic/Images/EmotIcons/BigGrin.png)
![https://forum.reallusion.com/uploads/images/502ea2b4-a09c-48f5-b8a6-b0e7.png](https://forum.reallusion.com/uploads/images/502ea2b4-a09c-48f5-b8a6-b0e7.png)