Oracle Stored Procedure Call with parameters

[Su]

Hi,
I have a job that takes records from a sequential file , does some basic transformations and then links to an OCI8 stage.
In the OCI stage I want to call an Oracle STored procedure that will insert into multiple tables.
I need to pass the the sequential file fields as parameters to this stored proc.
How can it be done? we are forced to specify a tablename in the OCI8 stage. What tablename do i give here? What do i set the updateaction to? user-defined sql?
thanks in advance