Step 1: The first step is to open Calendar - base7 and click Settings
Step 2: Click Extras
Step 3: Click Add more Extras
Step 4: Select the Property
Step 5: Select which Account the extra belongs to.
Accounts are configures under Settings --> Payment Methods
Step 6: The VAT will be automatically set
Step 7: Add the Name of your extra
Step 8: Add the Unit price of the Extra
Step 9: Click Save
Step 10: You have successfully added your first pre-defined extra for the list
Step 11: Click on any reservation
Step 12: Click + Add in the Extras section
Step 13: The date will be set to today. You may change this if needed
Step 14: Select the account of the Extra
Step 15: Click Select an extra from the list
Step 16: Select the Quantity of items sold. Unit price and total will be automatically added.
Step 17: Click Save
Step 18: That's it. You're done.