In Simple Sense you can export a list of schemas to dump files like this:
expdp "'/ as sysdba'" DIRECTORY=DPDUMP_HRDB_DIR1 DUMPFILE=GHRDR_%U.dmp LOGFILE=GHRDR.log SCHEMAS=GHRDR_BI_PREP,GHRDR,GHRDR_PREP exclude=statistics PARALLEL=4
Since we specified to have 4 parallel threads, it will create 4 files.


expdp "'/ as sysdba'" DIRECTORY=DPDUMP_HRDB_DIR1 DUMPFILE=TRANS_HRDB%U.dmp LOGFILE=TRANS_HRDB.log FULL=Y "EXCLUDE=TABLESPACE,PROFILE,DIRECTORY,statistics,SCHEMA:\"IN ('ARCHIVE_USER','TRANS_HRDB','GLOBAL_HRDB','GLOBAL_INTERFACE_USER','TRANS_HRDD','PERF_DIRECT','GCM_DATA','GCM_APP','COMP','COMP_HIST','SYS','SYSTEM','SYSMAN','RMANUSER','RMAN','EXFSYS','WMSYS','DBSNMP')\"" PARALLEL=4