How to give a sequential serial number depends on inheritance؟؟؟

[ashrafalzyoud]

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seial	subject	tracker
1-0-0-0	TEST 1	A
1-1-0-0	TEST 2 -> SUBTASK FROM TEST 1	B
1-1-1-0	TEST 3 -> SUBTASK FROM TEST 2	C
1-1-1-1	TEST 4 -> SUBTASK FROM TEST 3	D
2-0-0-0	EXAMPLE 1	A
2-1-0-0	EXAMPLE 2 -> SUBTASK FROM EXAMPLE 1	B
2-1-1-0	EXAMPLE 3 -> SUBTASK FROM EXAMPLE 2	C
2-1-1-1	EXAMPLE 4 -> SUBTASK FROM EXAMPLE 3	D
2-1-2-0	EXAMPLE 5 -> SUBTASK FROM EXAMPLE 4	C
2-1-2-1	EXAMPLE 6 -> SUBTASK FROM EXAMPLE 5	D