Where are the technical approvals defined, that are executed in the Change - Normal - Assess flow?
Use the Change Approval Policy workflow activity to control the approval process for a change request by creating user and group approvals according to a change approval policy record. Multiple activities can be used in a workflow, where each activity can reference the same or different Change Approval Policies.
https://www.servicenow.com/docs/bundle/yokohama-it-service-management/page/product/change-management/concept/change-approval-policiy-wf-activity.html