Exporting Customizations to your App
A common use case is to extend a DocType via Custom Fields and Property Setters for a particular app. To save these settings to an app, go to Customize Form
You will see a button for Export Customizations
Here you can select the module and whether you want these particular customizations to be synced after every update.
The customizations will be exported to a new folder
custom in the module folder of your app. The customizations will be saved by the name of the DocType
When you do
bench update or
bench migrate these customizations will be synced to the app.