A Project Statement Join enables you to include a column from the Project Statement on the same row as items from other lists in a report. This also means you can use a column in the Project Statement to group and sort across multiple lists and sites. For example, imagine a scenario where you have added a Region column to the Project Statement. If you joined this column with the other lists in an Open Work report, you would be able to group by region in the report.
To create a Project Statement join: