You can import Usages to a Giraffe project in a variety of ways:

If the Usages in the import have the same name as Usages in your project,

you will be prompted to select how Giraffe treats the new usages.

Replaces Usages in your project with the imported ones. This will immediately update all project geometries with the new Usage(s).

Adds a copy of the imported usage(s) with the authoring project name appended (IE Residential from XX Project Name)

Keeps the Usages in the current project. The current project's Usage(s) will be applied to any imported geometry.

By default, Giraffe will apply your selection to all Usages with matching names.

You can toggle “apply different settings to each usage” to make individual selections