Schedule Management > Creating and managing schedules > Defining tasks, milestones, and work breakdowns > Creating dependencies between tasks
Using proxy tasks
A proxy task represents a real task in a different schedule and is used in cross-schedule dependencies. If the real task is deleted from the original schedule, that task is orphaned and no longer displayed in its schedule. The proxy is still displayed in the schedule in which it is used but listed as orphaned type instead of milestone, summary, and so on.
- You cannot modify proxy tasks. Modify the original task and the proxy task mirrors the change.
- You cannot create a proxy task for a task that exists in the same schedule.
- Proxy tasks are ignored when a schedule is imported to Microsoft Project.
- Template schedules can have proxies from other template schedules.
- Nontemplate schedules can have proxies from other nontemplate schedules.
Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.plm00054/use_proxy_task · retrieved 2026-07-10