How can i connect multiple doctype

i want to connect multiple doctype inside other doctype for example.

i have below DocType
DocType 1: A
DocType 2: B
DocType 3: C
DocType 4: D
DocType 5: E
DocType 6: F
DocType 7: G
DocType 8: H
DocType 9: I
DocType 10: J And so on…

I want to connect this DoctType name with each other

How can i manage that.