> For the complete documentation index, see [llms.txt](https://mindcodeinteractive.gitbook.io/easy-build-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mindcodeinteractive.gitbook.io/easy-build-system/reference/building-collections.md).

# Building Collections

Stores a list of [Building Part](/easy-build-system/reference/building-part.md) references into a named collection.\
Simplifies [Building Part](/easy-build-system/reference/building-part.md) reference selection and filtering in the inspector.

***

### How Collections Work

A [Building Collection](/easy-build-system/reference/building-collections.md) is a ScriptableObject that holds an array of [Building Part](/easy-build-system/reference/building-part.md) prefab IDs.\
Instead of adding parts one by one to the Building Input, you can assign a full collection at once.\
Collections can represent themed kits, unlock tiers, or any logical grouping of parts.

***

### Creating a Collection

1. Go to `Tools > Mind Code Interactive > Easy Build System > Components > Scriptable Objects > Create Building Collection`
2. A new [Building Collection](/easy-build-system/reference/building-collections.md) asset is created in your project.
3. Name it and add part references in the inspector.

***

### Using a Collection

Open the [Building Input](/easy-build-system/reference/building-controller/building-input.md) component on your player.

Under **Custom Part References**, select your collection from the dropdown and click:

**Replace With Selected**: Clears the current list and fills it with the collection's parts.

**Append From Selected**: Adds the collection's parts to the existing list without duplicates.

***

### Scripting Examples

Load a collection and read its parts:

```csharp
BuildingCollection collection = Resources.Load<BuildingCollection>("MyCollection");
string[] partIds = collection.PartReferences;
```

Create a collection at runtime:

```csharp
BuildingCollection collection = ScriptableObject.CreateInstance<BuildingCollection>();
collection.Name = "Runtime Kit";
```


---

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