Customizing New Order Emails – Woo Commerce

Hello Fiendly Support Forum World,

I am a contract worker helping a small business customize their new order confirmation emails. We have just launched a woo commerce subscription product, and wish to add notes to the confirmation emails to indicate “part #’s,’ so that each email lists part 1 of 3, part 2 of 3, and part 3 of 3. Is there a bit a code that could be added to emails’ php file to allow this functionality?

Thanks so much for your advice. Any help is greatly appreciated!

Best,
Eric