First of all thanks a lot for the replying...

I am new to seam, so need suggestions... taking only 2 entities (though there are 5).

Main root entity is Study.java, which is related to QuantExperiment.java(though QuantExperiment is list but it will be always One for Study).

When I click "Create Study" it takes me to StudyEdit.xhtml form, where I have added quantExperiment fields.

study fields
<s:decorate id="studyNameDecoration" template="layout/edit.xhtml">
     <ui:define name="label">Study Name</ui:define>
     <h:inputText id="studyName"  value="#{studyHome.instance.studyName}"/>
</s:decorate>

quantExperiment fields
<s:decorate id="entryPointDecoration" template="layout/edit.xhtml">
     <ui:define name="label">Entry Point</ui:define>
     <h:inputText id="entryPoint" value="#{quantExperimentHome.instance.entryPoint}"/>
</s:decorate>
.... so on
<h:commandButton id="save" value="Save"
                    action="#{studyHome.persist}" disabled="#{!studyHome.wired}"
                rendered="#{!studyHome.managed}"/> 

As of now I have not changed anything in studyHome, to make sure that I follow good process.... please let me know if understanding is correct.
On Save "studyHome.persist" is called which persits study fields but quantExperiment fields are persisted as null, this is because we need to somehow getQuantExperiment in studyHome and set in study before invoking studyHome.persist.

What should be proper code in studyHome, like first I should inject QuantExperimentHome... then override persist in studyHome.

@Name("studyHome")
public class StudyHome extends EntityHome<Study> {

     public void setStudyHjid(Long id) {
          setId(id);
     }

     public Long getStudyHjid() {
          return (Long) getId();
     }

     @Override
     protected Study createInstance() {
          Study study = new Study();
          return study;
     }
     
     //OVERRIDE
     @Override
     public String persist(){
         //GET QUANTEXPERIMENT FILEDS THEN ADD IT TO STUDY>>> somewhat like initStudy().setQuantExperiment(quantList); 
          return super.persist();
    }   

     public void wire() {
          getInstance();
     }

     public boolean isWired() {
          return true;
     }

     public Study getDefinedInstance() {
          return isIdDefined() ? getInstance() : null;
     }
}