It would be great if we could set a new rotation coordinate system

[jin35y]

When rotating an object in a desired direction, for example, if you want to make a copy of an already rotated object and rotate that copy as desired, the tool can sometimes be difficult to use, so it would be great if you could set a new coordinate system for rotation as you like.

[Simon]

You can use another object as the centre of rotation - for example create a sphere helper object and drag your object under the sphere in the groups panel to set it as a child. Now when you rotate the sphere it will rotate both objects around the sphere's centre.

[jin35y]

I understand. Thank you.