An item model can be used as a decoration or a destructible.
You can select an Item Model in Object Palette - Decoration/Destructible and drag it to the map in the Operation Area. You can also choose to place Random Decorations.
Term: Random decorations are divided into resources and components. Resources refer to the models that are preset in the Resource Manager and components refer to the decorations that are assembled in the Object Editor by yourself.
In Preset section, you can select to place the model for Individual or Regions through Brush Type and set it as Random Size and Random Angle.
In Object Editor - Decoration/Destructible, you can edit corresponding item models, for example, you can Change Material for an item model.