In case you want to automatically delete children items when a parent item is suppressed, you need to define the integrity parameter.
Open the properties of the children Foreign Key, and choose your prefered option.

The integrities are infinitely cascadable.

Many to Many

If you are using many-to-many relations in your component, you need to set this option for both foreign keys. (Most cases)

For every foreign key in the Pivot table, choose 'FK integrity' = 'cascad' in the field properties.
(The previous image is giving the example)