Welcome to the Community! QuickBooks Online allows you to add and delete accounts as necessary, as well as import your own chart of accounts. The chart of accounts is the backbone of your clients' company files, which makes the set up of these accounts important. I can shed some light on this for you.
When a new QuickBooks Online company is created, the system will ask which industry the company belongs to. The program then populates some industry specific accounts within the chart of accounts for you. QuickBooks Online doesn't contain pre-set templates for different industries to switch between after setup. With that being said, you can manually create any accounts that you're missing or you can import your own custom chart of accounts from an Excel file. You can find details on how to add or import accounts from the following Community articles: