The relation ship b/w middle lines can be achieved by +/-5000 logic.
I am explaining this for u in a simpler way. Assume evry thing i am mentioning below just suppose the numbers but the logic is the same we need to implement.

for suppose:
i/p1 file has O/P numer 1000
join2 has I/P number 5555 , O/P number 1111
reformat3 has I/P number 6666 , O/P number 2222
output has I/P number 7777

1.) Now we need to go like this comming frm i/p1 take 1000
2.) add 5000 which gives 6000
3.) now go to XXGFlow file search for line 6000



4.) So, from the XXGFlow file we will take 10555
5.) Substract 5000, 10555-5000=5555
6.) Go back to files search for 5555 , you will get it in join2 I/P number
7.) search in the same file (join2) for O/P number , u will get 1111
8.) add 5000 , 1111+5000 = 6111
9.) search in XXGFlow for 6111 and u got 11666
10.) substract 5000 , 11666-5000= 6666
11.) search for 6666 in our files u will get in reformat3
12.) now search for O/P number in reformat3, u will get 2222
13.) add 5000, 7222 . Search in XXGFlow , u got 12777.
14.) sub 5000 , u got 7777, search for 7777 in our files , it is Output_File
15.) job done.

Now in Input_File_f , we have
i/p1,join2,reformat3,output

Got it???

I just mentioned a small example , we can have n number of I/P files , many other files and may be more than one O/P files(im some cases we will have more than one O/P files).

So dude this is what i need.
I want u to be very clear abt this, bcz mostly dependent on u.
If u have still any doubts , come back to me.
Just for now get to know abt logic and then i'll tell u the key words for every number (I/P and O/P) and then we will try to figure it out.

I know it is a little bit difficult bcz even for me it took 1.5 month to figure it out. basically my need is:

I am working in Ab initio tool (some GE tool) , it stores every thing in unix.
Now i am in a situation to automate some thing , so i analysed how a gaph is stored in unix , how is it interpretating. At present we are now in the stage of scripting what i analysed and need.


Thanks a lot for ur patience