In Thr!ve, any order that includes any item with the word "Cater" in the item name will be reported as part of "Catering Sales". This is a quick and easy way for you to separate out these orders. If you don't want the items to include the name "Catering", just make a no-charge item called "Catering Order" that you apply to every order you wish to track this way.
Catering sales will report on the Manager Home sales report:
They will also report on the Store Summary - Sales by Order Type report. (These sales are also included in the order type counts above that section)