need a quick help multiple input value

Hi,

I don't know too much about visual composer. just did very simple one. I need some quick help from you guys.

service A output:

IDA

1

2

service B output

IDA IDB

1     1

1      2

2      3

2       4

Service C output

IDB  IDC

1      a

2       b

3       c

the scenario is:

from service A, i will get a list (1,2) ,which (as a whole )will be the input of the service b, then i will get output (1,2,3,4), this will the input of the service C, so finally i can  get the list (a, b,c), when user run the application , he should see the final list (a,b,c) , no button click.

basically i want to know how to output a list(multiple value) as the input of the another service.

it will be appreciated if someone can point me to the right document  or tutorial.

my vc is ce7.2.

thanks

Beset regards,

Jun