Hello there, @marina12.

You can create a bill to track the invoice you received from your supplier. I can guide you on how to do it.

1. Go to the + New icon.
2. Choose Bill.
3. From the Supplier ▼ dropdown, enter or select the supplier's name.
4. Choose the bill's term from the Terms ▼ dropdown.
   • This is when your supplier expects to be paid.
5. Enter the bill's detail. 
6. If you plan to bill a customer for the expense, select the Billable checkbox and enter their name in the Customer field. 
7. Click the Save and Close button.

You can read through this article to learn more details about tracking your expense-related transactions: What is the difference between bills, cheques, and expenses?

Swing by here if you have other questions about managing your supplier's invoice. I'm always here to help.

I know how to enter a supplier and load an invoice but i DO NOT WANT to enter a new supplier. this is a once off invoice which i just want to remember to pay at a certain date.

Thanks for getting back to us, @marina12,

If you want to create a bill without adding a new profile, you can select an existing name that's already on the list. Creating a supplier invoice will require a name for tracking purposes.

I'll be adding a resource guide here to help your way around QuickBooks: Manage Suppliers and Expenses

If you have any questions about this, or need further assistance with other things in QuickBooks. I'll be right here to help you.