Apple Motion 4 - Manual (Page 693)

For a replicator with only one cell (one source layer), the replicator and replicator cell
controls appear in the same Replicator tab. In this case, you can control every aspect of
the replicator directly from this single tab, which saves you from having to go back and
forth between the Replicator and Replicator Cell tabs. For a replicator with multiple cells,
the replicator parameters remain in the Replicator tab. The source wells for the layers
used as cells are listed in the lower portion of the tab.
Replicator tab for replicator
with a single cell Replicator tab for replicator
with multiple cells
693 Chapter 12 Using the Replicator