# Custom properties We cover in this page **how to use, create and manage custom properties in Rayon.** ### What is a custom property? Offering **custom properties** is Rayon's way of **allowing users to add data to their drawing**. This information can be added onto **`models`**, **`zones`**, **`walls`**, **`blocks`** (instances and definitions), **`shapes`**, **`layers`**, **`styles`**, and **`pages`**, and later be **retrieved, listed, and formatted in tables.** In Rayon's editor, **custom properties can be found in the `custom properties` section**, whenever some entities are selected.

### Creating a custom property Let's start by c**reating a new custom property.** \ With an entity selected, click on the **`Add property`** button. Then, click on the **`+`** button, in the header of the panel. This will allow you to **create a new property** that will be applied to the current selection.

You will now have to specify the **`name`**, **`format`**, **`type`** and **`value`** of the new property you are about to create. The property **`format`** expresses the kind of thing the property documents (a price, a name, a length, etc). In Rayon, available formats are: * Text * Length (in model units) * Area (in model units) * Volume (in model units) * Number * Price (in model units) * URL * Boolean * Image The **`type`**, then, allows you to choose whether the property should be a... * Single value * List of values (category single or multi) * Formula (a value computed dynamically, based on other properties) Clicking on **`Save`** will confirm the creation of the property and apply it to the current selected entity(ies).

### Applying custom properties Any existing custom property, present in the panel, can be **applied to the selection** by simply ticking its checkbox.

### Managing custom properties At any point, custom properties present in a model can be managed from the left side of the screen. The **`Custom properties`** panel stores all existing properties added by you or other users at any point. From there, custom properties can be... * Searched * Created (from the **`New property`** drop down) * Edited (name and default value(s))

### Inheritance Another useful feature of custom properties is **inheritance**. In other words, the custom properties carried at one level can be transmitted to a lower level. For instance: * **`Definition`** → **`Instance`** : A property carried by a block definition will also be carried by its instances. * **`Style`** → **`Entity`** : A property carried by a style will also be carried by entities carrying that style. At any point, an inherited property can be overridden; for instance, the value of a property inherited by an instance from its definition can be changed to a different, specific value. The value can then we set back to its initial value, by clicking on the reset icon present on the property value field. ### Tutorial For more step-by-step information, watch our tutorial about how to use tables and metadata in Rayon. {% embed url="" %} *** ### We are always available Book a demo with our team, [right here](https://b1kzip68v9f.typeform.com/to/Hgr0eQ4k#source=docs).\ To get some support, reach out to us through our **in-app support chat**. \ More about [our support policy right here](https://docs.rayon.design/other-resources/others/support).