@Abbirami You need to follow below steps -
1) Create a replication agent say agent-preview and configure the url etc of the Preview server. Under Triggers Tab you need to set No Status Update.
2) In your workflow edit Replicate with option process step and configure the Arguments -
replicationActionType=ACTIVATE
synchronous=true|false
suppressVersions=true|false
throttle=true|false
traverseTree=true|false
agents=agent-preview