You create a stock item if you want to add an extra to a client's account.
Click Settings.

Click Add/Edit Stock Item.

Click Search.

Click Add.

Enter the Stock Item details:
- Enter a Stock Code.
- Enter a Stock Name.
- Enter a Stock Category.
- Enter a Price for the extra.
- Click Save.

The Stock Item has now been created. The item can be used as an extra and added to a client's account.