Zero Transforms
Resets any scaling, translation (movement), and rotation applied to the picked objects.
Access this tool from the Transform tool palette:
About zero transformations
Each object and group stores its own transformation information (how much it is moved, rotated, and scaled from its starting point).
These transformations are applied hierarchically, so the group can be transformed separately from its parts. Sometimes it is useful to make an object or group “forget” its transformation information so its current position, rotation, and scale become the zero points.
To use the tool, pick the object in the viewport or use Object Lister to pick the group, then choose Zero Transforms.