---
alias: tutorials-durables-management-contains-durables-library
description: "Run the durable library scenario by enabling Contains Durables Library and reusing attached durables."
---

# Scenario 3: Use the Contains Durables Library Option

When you enable the **Contains Durables Library** option, the **Resource** acts as an internal durable pool instead of a fixed set of attachment positions.

Use this final scenario after [[tutorials-durables-management-two-durable-products]] to see how the same durable rules work when the **Resource** keeps the **Durables** in a library.

In semiconductor manufacturing, reticles are a common example. The same exposure tool can process many **Products**, and each **Product** can require several layers. A reticle library allows the **Resource** to store, validate, and track the available reticles without removing them after every execution.

|Reticles used as durables in an exposure process|An exposure tool that stores multiple reticles in an internal library|How different products and layers reuse durables from the same library|
|-|-|-|
|![Example showing reticles used as durables in an exposure process.](../images/scenario_three_product_layer_example.png)|![Example showing an exposure tool that stores multiple reticles in an internal library.](../images/scenario_three_reticle_example.png)|![Example showing how different products and layers reuse durables from the same library.](../images/scenario_three_library_equipment.png)|

1. Select `true` in the **Contains Durables Library** field on the **Resource**. You can do this only when no **Durables** are currently attached.

    ![Screenshot showing the resource configuration with Contains Durables Library enabled.](../images/scenario_three_contains_durables_library.png)

1. Select **Manage Durables** or **Perform Setup**, and assign the required **Durables** to the library.

    ![Screenshot showing the durable library assignment on the resource.](../images/scenario_three_manage_durables.png)

1. Repeat the first two scenarios, but keep the **Durables** in the library of the **Resource** and change only their positions when needed.
1. Let the **Resource** manage the durable movements automatically, or adjust them manually if the use case requires it.
1. Remember that a **Durable** assigned to the library of a **Resource** cannot be used by another **Resource** at the same time.

This final scenario completes the progression from a single durable requirement, to two required **Durables**, and then to a durable library on the **Resource**.

Watch the recorded walkthrough below.

<!-- Video filename: durables_contains_durables_library.mp4 -->
{% set video_id = 'eac13337cee19bf4c78b4a96dd453fea' %}
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