The One-to-One Sync Options tab contains all of the options to perform one-to-one synchronizations. One-to-one synchronization means each unique task will have a one-to-one match within another Subproject or the Master Project that data can be posted to.
Task one-to-one cross-project unique id field
Set this option to the field that contains the unique identifier of tasks. This must be a value that is always the same on a task regardless if the task is in its native Subproject or has been combined with other Subprojects into a master project file. Many teams will refer to this as the Project Unique ID (PUID) field and it will be a text field that contains a formula in the native Subproject file.
