The purpose of the platform extension projects is to extend the capabilities of the facilities on a permanent and continuous basis to its wider community of experimenters and application developers in the end-to-end (E2E) 5G platform for large-scale trials and pilots in Europe. Therefore, it would be mandatory that the open call projects are designed to provide ongoing support during the entire lifecycle of the IMAGINE-B5G project. Towards this end, each open call project will be asked to provide a sustainability plan for provision of ongoing support.