With WooCommerce Emails module you can add custom emails to WooCommerce.
Start by setting number of custom emails in WooCommerce > Settings > Booster > Emails & Misc. > Emails > Custom Emails. In this section you can also set admin title for your custom emails.
After saving settings, go to WooCommerce > Emails, where you will find custom emails you’ve added earlier.
Click Configure on selected custom email. There you will be able to set: