Hopefully I didn't misinterpret your question, but once a form is saved in Laserfiche any changes you make to the form won't be reflected on that saved document. If you make changes on the Form side, those changes will affect any new forms or documents you save to Laserfiche. You will need to make sure that you're applying the metadata for your attachments as well. You can always have a Workflow that update information for the existing documents already in Laserfiche as well.