The Reuse All Chunks Reuse Judge is an implementation of the Chunk Reuse Judge that enables the reuse of Asset Chunks from any World Cell by any other World Cell, so long as the World Cells are from the same World Grouping and using the same LOD Group.
You can add this component by selecting a game object and then selecting from the Top Menu Bar:
Component -> Deep Space Labs -> -> SAM -> Chunk Reuse Judges -> Reuse All Chunks Reuse Judge
or by selecting a game object and using the Add Component menu via its inspector:
Component -> Deep Space Labs -> -> SAM -> Chunk Reuse Judges -> Reuse All Chunks Reuse Judge
Remember, when Use Single Chunk Set For All Cells is enabled, the default Reuse logic is exactly the same as a Resuse All Chunks Reuse Judge.
As such, if all LOD Groups using a Chunk Manager have this option enabled, it should not be necessary to assign a Reuse All Chunks Judge to the Manager.