QPs are required to make submissions for the requirements at the respective Gateways that are related to their statutory responsibilities.
While it is possible that there are Gateway(s) that a QP does not have to make submissions (e.g. Structural / M&E Engineers in the Design Gateway), these QPs need to provide inputs to the Registered Architect so that the submission encompasses all aspects of planning.
Individual professionals may submit independent submissions for agency-specific technical details to the specific agencies between the Construction and Completion Gateways.
More information on the Gateways in CORENET X's Redesigned Process can be found here.