# Simple Editor
## Working with the input & output model editor
{% hint style="danger" %}
After making any changes to the input/output model, be sure to save them by clicking the **Save** button in the bottom-right corner. Please note that all changes apply only to the current version of the rule.
{% endhint %}
{% hint style="info" %}
There are no limitations when creating input/output models. A model can have an unlimited number of root objects and child objects.
{% endhint %}
### Adding a Root object
To create a root object, click  button.
### Adding a Child object
To create a child object, click **+** sign on the parent object.
Adding a child input object
### Moving an Object (Dragging)
To move an object to another parent or make it a child, drag the object and drop it on the desired parent. To make a child object a parent, drag it and drop it at the same level as the current parent.
Dragging I/O objects
### Showing Child Objects
To view child objects, click the arrow next to the parent object.
### Deleting an Object
To delete an object, click the **Delete** button on the object.
### **Viewing Object Structures**
To display the entire structure and all objects, click the  button. To view only parent objects, click the  button.
### Renaming an Object
To rename an object, click its name. An input box will appear. After making your changes, click outside the box or press **Enter** key to close it.
{% hint style="warning" %}
Only letters, natural numbers and hyphens are allowed.
{% endhint %}
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