I am not very sure by "If the file1 is reading successfully" but I believe
you can achieve what you want by using the special cobol register
RETURN-CODE to change the return code in any special case you want.
And then you can set the condition code for step 2 accordingly.
In your cobol program Under any condition
COMPUTE RETURN-CODE = 8
Then in your Job for second step cond parameter
can be coded as
This way you can skip execution of step 2 by setting the return code in step 1 cobol program.