How to create a custom scoped table inheriting Change_task table?

[Navaneeth1]

I have a custom scoped application that has a custom table that inherits the Change Requests. I'd like to create a custom change_task table as well but when I try to create a new table in the scope, the "Extends Table" reference field does not contain the change_task table. 

Why is the change_task table not visible in the extends table list? Is there a way to make it shown here so I can create a table that inherits it?

[Harish KM · Accepted solution]

Hi @Navaneeth1 OOB change task table is not extendable, you need to extend from Task table or set extensible to true to extend change task table