Hi Sankar,
If you haven't get the answer, you can try below. Just have this code in your submit servlet.
import com.adobe.aemds.guide.servlet.GuideSubmitServlet;
Map<String, String> redirectParameters = GuideSubmitServlet.getRedirectParameters(slingRequest);
redirectParameters.put("responseId", responseId);
GuideSubmitServlet.setRedirectParameters(slingRequest, redirectParameters);
You can capture this value using javascript callback function in submit button rule and pass this value to formB
guideBridge.submit({
error : function (guideResultObject) {
success : function (guideResultObject) {
alert(guideResultObject.data.responseId);
}
});