---
alias: user-guide-manage-experiment-submaterials
description: "This documentation outlines managing sub-materials linked to an active experiment transaction"
---

# Manage Experiment Sub-Materials

:lock: Experiment.**Edit**

## Overview

This operation is used to manage the **Sub-Materials** associated to an **Experiment.**

## Setup

No specific setup is required other than to meet the precondition of the transaction.

## Preconditions

* The **Experiment** exists and is Active.

## Sequence of Steps

### Step 1: Manage Sub-Materials

1. Select the number and Material Group you want to change the **Sub-Material** assignment and select a new **Sub-Material**. For quicker assignment, select the icon on top of the material group panel to define the criteria by which you will assign the **Sub-Material**. Select one of the options:

      * **Assign by Sub-material Name** - The first **Experiment** number is assigned with the first **Sub-Material** sorted by name (ascending).
      * **Assign by Container and Position** - The first **Experiment** number is assigned with the first **Sub-Material** sorted by **Container** and Position (ascending).
      * **Assign Remaining Randomly** - positions are assigned randomly.
      * **Clear** - remove current assignments.

2. Select **Update** to complete the transaction.

![Screenshot showing management of sub-materials in an experiment.](../images/manage_experiment_submaterials.png)