It looks like the common requirement that we do have while implementations or development.
I got it fixed by performing writing some DOM level scripts where , i was able to access the field value from the form using window.parent.g_form.getValue('varName');
Note : ISOLATE SCRIPT checkbox needs to be considered here.
However as DOM Manipulation is not supported by service portal, i am waiting for a better approach, but for now going ahead with this way.
Hope this would be helpful to some one looking for the same.
Regards,
Siva
