A new submission is one that you are submitting for the first time.
A resubmission is one that has previously been submitted and now is being submitted again. For example, modifying a product from a prototype to production or modifying a product that was ruled nonconforming. If your product is a resubmission, be sure to enter the previous decision # in the “Resubmission Decision #” field.
A replacement is one that needs to be submitted again due to circumstances such as damage to the product.