INSERT INTO print_development.categories (id, name)
VALUES (select id, name from print_pro.categories where parent_id is NULL);
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'select id, name from print_pro.categories where parent_id is NULL)' at line 2
У вас неправильный синтаксис INSERT/SELECT. Вы не используете "VALUES", просто используйте SELECT.
INSERT INTO print_development.categories (id, name)
select id, name from print_pro.categories where parent_id is NULL