In Altium Sheet to Sheet References are referred to as Port Cross References.
For hierarchical designs you would NOT use Port Cross References since all references lead to the top hierarchical sheet in the project.
When flat (Non-hierarchical) schematics are preferred. Port Cross References can be used to aid in following the circuit flow from sheet to sheet.
To generate sheet to sheet references in the schematic:
Reports > Port Cross References
Note if you have a hierarchical top sheet then "Add To ..." is not an option, you will need to delete the hierarchical top sheet to create Port Cross References.
Gotch'a ! Compile your project before adding "Port Cross References".
Also to update a design you will need use Remove From ... and then Add To ...
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