Hi @avi_infy,
You can achieve your goal using replication api:
First you will need to know replication agent id you would like to use, you can check this under /miscadmin#/etc/replication/agents.author, getting value from Name column

Next you can use below snippet of the code. It use AgentIdFilter to use only specific replication Agent. Below is sample workflow step, you may need to change the way how you are getting path you wanted to replicate, as well as agent id. But it should give you clear idea how to use replication api. Please also make sure workflow user you are using has replication permission.
package com.mysite.core.workflow;
import com.adobe.granite.workflow.WorkflowException;
import com.adobe.granite.workflow.WorkflowSession;
import com.adobe.granite.workflow.exec.WorkItem;
import com.adobe.granite.workflow.exec.WorkflowProcess;
import com.adobe.granite.workflow.metadata.MetaDataMap;
import com.day.cq.replication.*;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import javax.jcr.Session;
@Component(
service = WorkflowProcess.class,
property = "process.label=CustomReplicationStep"
)
public class ReplicationStep implements WorkflowProcess {
@Reference
private Replicator replicator;
private final static String agentId = "publish2";
@Override
public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap metaDataMap) throws WorkflowException {
AgentIdFilter agentIdFilter = new AgentIdFilter(agentId);
ReplicationOptions replicationOptions = new ReplicationOptions();
replicationOptions.setFilter(agentIdFilter);
String path = workItem.getWorkflowData().getPayload().toString();
try {
replicator.replicate(workflowSession.adaptTo(Session.class),
ReplicationActionType.ACTIVATE, path, replicationOptions);
} catch (ReplicationException e) {
e.printStackTrace();
}
}
}