# Lists

> Create and manage dropdown lists in the IS Tools data model editor. Add, edit, and link list items to Drop-down fields for structured data entry.

[Application configuration](application_configuration.md) > [Data model editor](data_model_editor.md) > Lists

Fields of type [Drop-down](field_types.md#drop-down) limit entries to certain items. These items are contained in _lists_ defined and associated to the Drop-down by the administrator.

## Create a list and items

Click on the **Lists** tab. _To add a new list_, click on the ![BlackPlusIcon](_images/BlackPlusIcon.png) icon, type the desired name (e.g., "List of services", overriding the original "New list" name) and hit _Enter_.

Then, _add items_ o the list by clicking on the ![BlackPlusIcon](_images/BlackPlusIcon.png) icon of the **List items** tab, type the desired name (e.g., "Installation", "Upgrade" and "Repair") and hit _Enter_.

Finally, click the Save button at the top of the **Data model editor** to keep the changes.

## Edit a list and items

Click on the **Lists** tab. To _change the name_ of a list or an item, double-click its current name and type a new one.

To change the order of items, select one and drag and drop it to the desired position. You can also use the ![SortAlphabetically](_images/SortAlphabetically.png) Sort alphabetically icon, in case you need to sort them all at once.

> **Note:**
> 
> Note that the edition of the **Type** property, or the **Parent item** (via the ![AssignParents](_images/AssignParents.png) icon), is part of the [Linked drop-down](fields.md#_link_a_drop_down_field) functionality configuration.

Save changes by clicking the Save button at the top of the **Data model editor**.

## Delete or remove a list and items

Click on the **Lists** tab.

For _deletion_, select the _list_ or the _item_ you wish and click the corresponding ![DeleteNDME](_images/DeleteNDME.png) icon.

> **Note:**
> 
> A list that is associated to a drop-down cannot be deleted. To disassociate it, go to the **Tables** tab, select the table, select the drop-down in the **Fields** tab and then remove the list from the [**List/Parent table**](fields.md#list_parent_table) setting.
> 
> Note that the items contained in a deleted list are also deleted, except for the those that are marked as Parent items in **Type**, which will be displayed in **Lists**.

Save changes by clicking the Save button at the top of the **Data model editor**.

## Link a list and items

See [Link a drop-down field](fields.md#_link_a_drop_down_field).