With 10to8 you have two options to delete customer profiles, you can either delete them in bulk or one by one.
When deleting a customer record it will delete the customer and all the data related to the customer (name, email, phone number, appointments, etc.). Hence, before doing that you might want to Export their record from Inbox & Reports > Export Data.
To get started head over to “Customers”.
Deleting customers in bulk
If you click on the drop-down arrow next to “+ Add Customer” you will get the option to “Delete All Customers”. You can either just delete all your customers in bulk, or use the “Search” box to narrow down the customers to be deleted. Using this option will delete all customers in the current search result and it will tell you how many customers this is just under the button.