Hello, BB Santosa. I can help you record the transactions from your inactive customer to your vendor.

We will have to manually record your customer's transactions into your vendor's register. Before doing so, let's go ahead and create a Customer list so it will be convenient to enter the transactions you need to create. Refer to the steps below:

1. Go to Reports.
2. In the search bar, enter Transaction detail. Then choose Transaction Detail by Account.
3. Select Customize in the upper right.
4. ClickGeneral, then choose your preferred date from the Report period dropdown.
5. Select Rows/Columns, then choose Customer or Vendor.
6. Choose Filter.
7. Select customer or vendor, then from the dropdown choose the person that you want to have the report.
8. Select Run Report on the bottom right.

After generating the report, we can now enter them manually under your vendor's register. Here are the steps to do that:

1. From the left menu bar, select Expenses.
2. Go to the Vendor bar.
3. Select the vendor.
4. Click New Transaction.

I'll also share an article to help you distinguish between bills, checks, and expenses: Learn the difference between bills, checks, and expenses in QuickBooks Online.

Additionally, if you need to keep track of your bills and record payments in the future, you can refer to this article: Enter and manage bills and bill payments in QuickBooks Online.

We always have your back if you have more queries in recording transactions. Just comment on this thread and I'll be glad to assist you further. Take care.