In reply to Peter.

Yes, I believe so. Neither PROC EXPORT with DBMS=XLSX, nor ODS EXCEL, can write to a named range or update a partial sheet.

PROC EXPORT can update a workbook with a new/replaced sheet (entire sheet). So if you're workbook-report is organized such that you can source your range from another sheet in the file, then maybe that can work without the additional PC Files Server.