Where are bouts on QuickBooks do you load lunch as a subsistence expense when I am travelling around the country

Most businesses will have a Category (or in UK called Nominal account) called either "Subsistence" and sometimes combined with travel and called "Travel & subsistence". These are set up in your Chart of Accounts as:

Account Type: Expenses

Detail Type: Travel meals or Travel

Name: Subsistence or Travel & subsistence (depending if you wish to combine)

Select this Category when you Add the transaction in your bank feeds. 

If these expenses are not being made by a business bank account already set up in QBO you may need to set up an "Expenses" bank account in the Chart of Accounts.

It does depend on whether you are an employee claiming from your employer or are a sole trader/freelancer working for yourself how you set up this side of it.