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There is a need to pass values from the parent form to the child form using relationship behavior in the Backend of an application.

In the parent controller, the `relationExtendManageWidget()` function is overridden, and the model used in the widget of the child form is accessed using `$widget->config->model`. Then, a dynamic property is added to the model using the `addDynamicProperty()` function, so that this property is not saved to the database, as it is only used for filtering logic.

```
public function relationExtendManageWidget($widget, $field, $model) 
{
    if($field == 'actresses' 
        && property_exists($widget->config, 'context')
    )
    {
        $widget->config->model->addDynamicProperty('_active_continent_id', $model->continent_id);
    }
}
```

To use it, for example, there is a dropdown in the child form to display a list of countries in the selected continent previously selected in the parent form, then we simply do:

```
country:
    label: 'Country'
    nameFrom: name
    span: full
    type: relation
    scope: '\Foo\Bar\Actress::getFilteredCountryBasedOnContinent'
```

Then, the function is filled in as follows:

```
static public function getFilteredCountryBasedOnContinent($query, $model)
{
    $query
        ->where('continent_id', $model->_active_continent_id);
}
```

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