GGSCI (redhat346.localdomain) 5> ADD EXTRACT load1, SOURCEISTABLE
GGSCI (redhat346.localdomain) 6> EDIT PARAMS load1
GGSCI (redhat346.localdomain) 16> START EXTRACT load1
GGSCI (redhat346.localdomain) 28> info extract load1

TARGET

GGSCI (devu007) 1> ADD REPLICAT load2, SPECIALRUN
GGSCI (devu007) 2> EDIT PARAMS load2

Reference :
http://gavinsoorma.com/2010/02/oracle-goldengate-tutorial-8-filtering-and-mapping-data/