Now that I have gone through the process and got my Green card approved, I wanted to share how I got this worked out for me.
1. Your spouse (USC) needs to submit I-130 to USCIS along with all the required documents of I-130.
2. Once I-130 gets approved, send a letter to USCIS requesting to Interfile your pending I-485 with the newly approved I-130, along with the copy of I-485 Notice, copy of I-130 Approval Notice and completed I-864 form and the supporting documents for form I-864.
I did NOT send new I-485.
Even my lawyer or USCIS infopass could not able to give this simple information and they told me to file a new I-485, which would have been waste of money and time.
So interfiling is possible in this case. Best of luck!