Reference Planes: Select six planes
to define the box to view the plane selection preview in 3D.
You can also select planes from SRS.
You must select the planes in sequential order.
For example, if you select the first plane from deck
plane list, then next plane selection must be a deck
plane. The third plane can be any plane other than the
deck plane, the fourth plane should follow the third
plane selection.
To modify the selected plane, select the corresponding
plane in the list and select another plane either from
the 3D area or from the SRS.
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