Get BITS sealed transcripts delivered to your home. Then put them along with degree certificate in a new envelope and send it to WES.
OR
You can ask BITS to send sealed transcripts directly to WES, then send degree certificate to WES separately.
I went with the first option because it's easier, cheaper and faster IMO.
Thanks so much for a prompt response. What's the usual turn around time for BITS to deliver transcript to home? Also, do they send it in sealed/signed enveleope, as per WES requirement?