Split all selected objects: Select this option if you do not want to preserve objects that are not crossing the split plane but are part of the selection.
Split all selected objects crossing split plane: This option allows you to identify selected objects that do not cross the split plane and ignore them for the operation. For a multiple selection, only those objects that cross the split plane are split; others are kept intact. By design, splits in existing designs from previous software versions are not changed.
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