Once you click "Create Invoice" from Manage Invoices, this is what you will see on your screen:
Follow the following steps to create an invoice:
Add Customer by clicking "+Add Customer".
Click "Let's Search & Add" for adding items to your invoice.
Search items from your inventory in order to add it in the invoice.
Once the item is added, click on "save" to create and invoice.
After saving, click on "checkout" to complete an invoice.
Invoice history can be viewed and notes can also be added from the right side of the invoice as shown below.
Important: You can only search and add the items that are saved in your inventory.