SPLIT='character'
specifies the split character. PROC REPORT breaks a column heading when it reaches that character and continues the heading on the next line. The split character itself is not part of the column heading although each occurrence of the split character counts toward the 256-character maximum for a label.

Default: slash (/)
Restriction: This option has no effect on ODS destinations other than traditional SAS monospace output. However, in these ODS destinations, the SPLIT= option works in the column heading.
Interaction: The FLOW option in the DEFINE statement honors the split character.

非常感谢！