You can provide update for an application that is already published in the CSDB. Follow these instructions based on the application for which you are providing an update:
.ipa
file) contains an application and a provisioning profile. This provisioning profile expires every 12 months. If the provisioning profile expires, the end-user will not be able to access the application. In such scenarios, an administrator must rebuild the application with the renewed provisioning profile, and publish it to the CSDB. You must link this new package with the existing service that was used to deploy the package.