To Define a Non-Graphical Sub-Feature

Create the table with no geometry column, one ID, and one foreign key.
CREATE TABLE NOGRAPHIC

(Id NUMBER PRIMARY KEY,

LinkedID NUMBER,

NAME VARCHAR2(50));
Create the foreign key constraint defining the non-graphical sub-feature.
alter table NOGRAPHIC

add constraint NOGRAPHICCABLE_FK

foreign key(LINKEDID)

references CABLE(ID)

ON DELETE CASCADE;