# Adding a quote field to the checkout
**This playbook scenario goes through all steps to create a block. In this case, we are going to add a new field to the quote itself, called `yireo_training_example`.**
## Add a new database column to the `quote`
Create a file `etc/db_schema.xml`:
```xml
```
> Here, we are extending upon a core table `quote`. This is not best practice, because this could lead into issues when you are not using blue/green deployment and are adding this new column to an existing table with large numbers of rows. The alternative is to create an extension attribute, which is out-of-scope for this example tutorial. Or use blue/green deployment temporarily for such a change. For a new shop, this probably is no issue.
Also create a file `etc/db_schema_whitelist.json`:
```json
{
"quote": {
"column": {
"yireo_training_example": true
}
}
}
```
## Run the database upgrade
```bash
bin/magento setup:upgrade
```
Confirm that the table `quote` has a new column `yireo_training_example`.
## Add output to the checkout
Next, create a file `view/frontend/layout/loki_checkout_block_customer.xml`:
```xml
Yireo Example
Enter some value
```
> Note that you do not need to create a PHTML template for this. You are reusing one from the `Loki_FieldComponents` module.
Finally, create a file `etc/loki_components.xml`:
```xml
```
This XML file reuses definitions (`viewModel`, `repository`, `context`) from a group `quoteFields`. If those classes are sufficient, you don't need much else. You could also extend them with your own PHP classes. In that case, the `etc/loki_components.xml` entry needs to be updated as well.
## Refresh the cache and voila!
```bash
bin/magento cache:flush
```
You should now see a new field in the checkout named `Yireo Example`. When a value is entered, an AJAX request will save the value into the `quote` table.
## Where to go next?
- See the documentation on [Loki Field Components](/field-components) to learn what else you can configure via the XML layout;
- If you want to add validators, filters or extend upon the component itself, go for the docs on [Loki Components](/components);
- This XML file reuses definitions (`viewModel`, `repository`, `context`) from a group `quoteFields`. If those classes are sufficient, you don't need much else. You could also extend them with your own PHP classes. In that case, the `etc/loki_components.xml` entry needs to be updated as well.
- There is no need to turn this into an extension attribute. However, if you want this to work easily in other non-checkout-related features (adding the attribute to the order email, the invoice email, the backend, etc), it is probably handy. But out-of-scope here. But if you would go for this, make sure to create your own component repository class.