You can resolve a backend to a tier from the backend's dashboard page, either its Remote Service Dashboard or Database Dashboard. In the database dashboard, from the Actions menu, click Resolve Backend to Tier and select an existing tier or create a new one. Similarly, you can see backends that are associated with a tier and unresolve a backend from the action menu for the Tier dashboard.

Deleting the backend from the tier causes it to re-appear as an unresolved backend in the flow map or resolve it to a different tier.