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Here's Gem Island, with a crate and a barrel

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made from GameStudio's kits, both selected.

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To reuse them, open Game Assets in the 3D View's header.

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There are no asset libraries yet.

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Click Add Selected to Library.

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The library is called props:

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it's saved in your project's

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assets folder, as props dot blend.

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Tick One Asset per Object,

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so the crate and the barrel become two assets.

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Tick Replace with Instance, so the ones in

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the level become copies of the library too.

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Prefab stays on:

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library assets are prefabs,

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so your game's code can spawn them too.

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Click OK.

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Game Assets now lists the props library:

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the barrel and the crate.

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Place puts a copy at the 3D cursor, on the right.

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Place a barrel.

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Changed your mind?

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Replace swaps the selected copy

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for another asset, in the same spot.

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Make it a crate.

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Every copy only links to the library.

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Save the level with Control S.

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Now change the original.

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It's in the library file, so press Control O to open it.

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You're in the project's scenes folder.

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Go up one folder.

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Click the assets folder, where the libraries live,

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and click Open to go in.

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Click props dot blend, the library file,

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and open it.

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This is the library:

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each asset is a collection, standing at the origin.

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Click the crate.

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Make it bigger:

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press S, type one point five, and press Enter.

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Save the library with Control S.

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Now back to the level.

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Shift Control O lists the files you opened recently.

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Choose main dot blend.

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Back in the level, both crates are bigger,

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the one you placed and the original.

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The barrel didn't change.

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Edit an asset once, and every copy follows, in every level.