How to show subcategory on checkout page and on email send to admin in Woocommerce plugin

i have a website which has woo-commerce plugin and i want to do like

Category - Vegetarian, Non Vegetarian, Drink etc

Under main category there are subcategory which are used as the restaurants.

Sub category as Restaurants name - Mcdonalds, dominos etc.

Now i want that subcategory name shown in checkout page,order view page as well as on email sent to admin so that admin can confirm that in which restaurant this order will go.

via Chebli Mohamed