A cascading List of Values (LOV) means that the values of one list should be refreshed if the value of one list on this page gets changed. For example value of the State, drop-down depends on the value of the selected Country.

To meet this requirement, I have captured a short video on this that will help you to achieve Cascading List of Values (LOV) in Oracle APEX.

Click on the below link and view the complete video:

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Further readings:

How to create an Oracle APEX service

Insert data into a table using SQL in Oracle APEX

Form region to insert a record into a table in Oracle APEX

Master-Detail Page in Oracle APEX

Cascading List of Values in Oracle APEX

Oracle APEX Interactive Grid with CRUD operation