You can display the reference lines for one or more groups on a single group at the same time in the same viewbox. For example, you can display reference lines for the axial and sagittal groups over a single coronal group.
1. Point to the upper left corner of the group containing reference lines you want to see.
2. Click and drag the group to the group on which you want the reference lines to appear.
3. In the main menu, click View --> Auto Ref-Lines Setup.
The reference lines of the first (dragged) group appear on the second group.
4. Repeat steps 1 - 3 to display reference lines for additional groups.