Name invoice per month.

Help has arrived, @fransvdwalt789-g. 

To help you modify the invoices according to the details you need, you'll want to edit your Invoice number according to month. You can refer to the screenshot below for your reference: 

Alternatively, we can utilize the Custom Fields feature if you're using the Advanced version of QuickBooks Online. To create one, I'll show you how:

1. Go to the Settings menu and select Custom fields.
2. Click the Add Custom field. If you've already created a field, you'll see Add field instead.
3. Give your custom field a name.
4. Select the type of data that will go in your custom field: Text and number, Number only, Date, or Dropdown list.
5. Choose the category the custom field belongs to: Customer, Transaction, or Vendor.
6. Put a checkmark on the box for the forms you want the custom field to appear.
7. If you want customers or vendors to see the field on a form (such as invoices, estimates, or purchase orders), select Print on form. A maximum of 3 custom fields may have Print on form turned on for any single form type (such as Sales Receipt or Invoice).
8. Once done, tick Save.
   
   
   

Here's an article about this process: Add custom fields to QuickBooks Online sales forms and purchase orders.

Also, if you need to check on your best sellers, sales, and inventory status in the future, we can use a specific report. Check out this article: Use reports to see your sales and inventory status.

You can always reply if you have any other concerns regarding your invoices. Fill me in with the details in your reply. I'm here to offer help.