how to do recursive looping....

[vikashs]

@vikashs

As per our requirement we have input and output structure likes this:-
Input pipeline:
DocList
A
B
Ref of DocList
A
B
Ref of Doclist
.
.
OutPut pipeline:
DocList
A
B
C
Ref of DocList
A
B
C
Ref of Doclist
.
.

Field C we need to hard code with some value in our output recursive list, So please suggest us how we can perform this.