Hello there, @windrushfarm.

Your default Accounts Receivable is the one that was created when you set up your company in QuickBooks Online or those you selected during conversion. However, if in your case you want to have two invoices to be recorded in their respective Accounts Receivables, you can do either one of the following:

First, set up parent and sub-customers to group your open receivables. This allows you to group and sub-total your open receivables by the parent customer. Here's how:

Step 1: Create a parent customer

You must create a parent customer for each Accounts Receivable type you need in order to be able to group your open receivables by the parent customer.

1. Go to Sales and select Customers.
2. Select New customer to open the Customer information dialog.
3. Specify a name for the account in the Company field. To locate the parent customer, utilize the name of an Accounts Receivable account on the Chart of Accounts.
4. Select Save.

Repeat the steps for every Accounts Receivable you need.

Step 2: Change your existing customers to sub-customers.

You need to identify which customers are sub-customers of the parent you created.

1. Go to Sales and select Customer.
2. Locate and select the existing customer to change.
3. Select Edit to open the customer information.
4. Select the Is a sub-customer checkbox.
5. Choose the parent customer you created from the Parent customer dropdown list.
6. Select Save.

Your open receivables can now be totaled, grouped, and filtered by parent accounts for customer reports.

Another way to group or divide receivables is to use location tracking. You must turn on location tracking first on the Advanced tab of the Account and Settings page. After that, you may set up several locations to utilize by selecting the Location item on the All Lists screen. Please refer to this article for more information about location tracking: Set up and use location tracking.   

When locations are enabled and configured, you may run your report to ensure that every transaction is attributed to a location that is connected with an Accounts Receivable type, and then you can customize it to only report on one location at a time. You must run a separate report for each location, as you cannot run one report and sort it by location.

Here's an article I've included that will help you in customizing your reports: Customize reports in QuickBooks Online. 

Let me know if you have any other concerns in handling your invoices and Accounts Receivables in QBO. I'm always around to help. Have a great day!