> For the complete documentation index, see [llms.txt](https://knowledgebase.qommentary.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledgebase.qommentary.com/qommentary-writeback/custom-data/adding-input-columns/dropdown.md).
# Dropdown
**Dropdown** controls are one of the most popular controls used to select a single value from a list of options. They are often used to set a status, tag records with specific labels or simply pick one value from multiple options.
Dropdowns can be custom (user-driven options) or countries (pre-set list of countries with flags).
**Data type**: `string`
### Adding a Dropdown control
1\. Edit your sheet\
2\. Click on the **Qommentary Writeback** extension\
3\. Expand **Input Column** section\
4\. Click on **Add column**
5\. Select **Dropdown** from the dropdown menu
6\. Add a **label** to be displayed as a column header
7\. Add a **field** name
{% hint style="danger" %}
If database is selected as data connection, then field name **must map** to destination table column name.
{% endhint %}
{% hint style="warning" %}
Field name cannot contain spaces.
{% endhint %}
8\. Click on **Done**
**Dropdown** input column can now be updated and saved.
### Custom dropdowns
If you wish to create dropdowns with custom values, please please follow these steps:
1\. Edit your sheet and select the Qommentary Writeback extension\
3\. Expand the *Input Columns* section and **Dropdown** input control\
4\. Scroll down to *Dropdown Type* and select **Custom** from the dropdown menu
5\. Click on **Add option**
6\. Enter an option **Name**
7\. Repeat steps 5 and 6 as many times as needed
{% hint style="success" %}
The custom options are now displayed in the dropdown column
{% endhint %}
### Dimension dropdowns
If you wish to use a field or dimension as the source for your dimension values, please follow these steps:
1\. Edit your sheet and select the Qommentary Writeback extension\
2\. Expand the *Input Columns* section and **Dropdown** input control\
3\. Scroll down to *Dropdown Type* and select **Dimension** from the dropdown menu
4\. Update the expression with the field name you would like to use
{% hint style="success" %}
The field dimension values are now displayed in the dropdown column
{% endhint %}
### Country dropdowns
The Dropdown control includes a curated list of countries with corresponding flags which you can use out of the box in your writeback table.
To create a countries dropdown, please follow these steps:
1\. Edit your sheet and select the **Qommentary Writeback** extension\
3\. Expand the *Input Columns* section and **Dropdown** input control\
4\. Select **Countries** from the dropdown menu
{% hint style="success" %}
A full list of countries with flags are now displayed in the dropdown column
{% endhint %}
