Hi Ratnakar,
If that's your scenario, then I would advice against creating one more SO line EH. All you need is one more set of Expected Events for this new delivery. Use EVM_EE_UPDATE activity to add expected events. Number of deliveries you have, that many sets of EE will be there. You can use datacs fields as checked field and store delivery number there which helps in your event posting to post against correct EE.
Also, you can add the delivery details as message parameters and some important fields like delivery number as both message and control parameters so that you know which event is for which delivery.
For message parameters, use this blog:
SAP EM Blog Series #9 - Deciding on what parameters to use
Thanks,
Vishnu