The **Manage Portfolio domain** is one of seven domains in the [[Common Service Data Model|Common Service Data Model]] (CSDM), a reference architecture developed by [[ServiceNow|ServiceNow]] that provides prescriptive guidance on service-related definitions and data modeling within the ServiceNow AI Platform. Unlike the other CSDM domains that represent distinct stages in the [[CSDM Service Life Cycle|CSDM Service Life Cycle]], the Manage Portfolio domain encompasses portions of all five life cycle stages: [[Ideation & Strategy (CSDM domain)|Ideation & Strategy]], [[Design & Planning (CSDM domain)|Design & Planning]], [[Build & Integration (CSDM domain)|Build & Integration]], [[Service Delivery (CSDM domain)|Service Delivery]], and [[Service Consumption (CSDM domain)|Service Consumption]]. This cross-cutting structure reflects how service owner responsibilities often extend beyond business services to include oversight of [[Business Application (CSDM)|business applications]] and their deployed instances known as [[Application Service (CSDM)|application services]]. The domain provides service owners with visibility across the true breadth of their responsibility, enabling them to manage financial accountability for business applications while overseeing the effective deployment of application instances. For example, an HR service owner may have financial responsibility for the HR business application and direct oversight of HR application service deployments, even though troubleshooting and repair fall under related [[Technology Management Service Offering (CSDM)|technology management service offerings]]. The domain leverages [[Portfolio (CSDM)|Portfolio]] structures—collections of services, products, projects, or applications managed together—and specifically [[Service Portfolio (CSDM)|Service Portfolio]] for hierarchical classification of [[Business Service (CSDM)|business]] and [[Technology Management Service (CSDM)|technology management services]] that define strategic business value and facilitate life cycle management.