# Allow Simulation of Nodes
URL: https://docs.valsight.ai/allow-simulation-of-nodes/
Description: This guide shows you how to mark nodes as simulatable so that their values can be changed in a simulation workspace.
Mark nodes as simulatable so that their values can be changed in a simulation workspace.

## Prerequisites

* You have an existing model with at least one node.
* You have edit access to the model.

## Steps

### Open the model in the Model Editor

### Select the node you want to make simulatable

Click the node on the canvas (for example, `Cost`). The Node Editor panel opens on the right.

### Enable the Allow Simulation toggle

In the Node Editor, locate the **Allow Simulation** toggle and enable it.

![Allow simulation on node.png](./images/6895403016.png)

### Repeat for each simulatable node

Work through the remaining nodes whose values should be editable in a simulation workspace.

## What you have done

The selected nodes are now marked as simulatable. In a simulation workspace, users can override their values to explore different scenarios, while all other nodes remain read-only.

## Related

* [Creating and Configuring Models](/creating-and-configuring-models/)
* [Add Nodes to a Model](/creating-nodes/)
* [Model Editor UI](/model-editor-ui/)