Hello there, Katie R. 

Thanks for getting back to us with further details. Allow me to jump in and add some details to the answer provided by my colleague @Kristine Mae and helpful contributors @qbteachmt and @Pete_Mc.

You can see at the top most center part of the program the QuickBooks edition you're using (see screenshot below). The options and workarounds given above are available regardless of the versions you're using. 

Generally, QuickBooks Desktop allows you to set up vendor transactions reminders on or before a specific due date. However, the option to remind you of those overdue ones is currently unavailable (you can do it on the invoices side though). 

As mentioned by @qbteachmt above, you'll want to use the To Do's or Notes columns in the vendors' profiles and set a later date as an overdue reminder (see screenshots below).

To do this:

1. From the Vendors tab, go to Vendor Center. 
2. Pick a vendor. 
3. Choose To Do's/Notes.
4. At the bottom part, click Manage To Do's or Manage Notes.
5. A window will come out, enter the necessary details.
6. Click Ok. 

You can also use the approach given by my colleague @Kristine Mae which is to memorize the transaction and add it to the reminders list.Check out the steps and screenshot she provided above. Once done, have the program automatically show these reminders every time you logged in.

Refer to the steps below:

1. Go to Edit at the top menu bar, then Preferences.
2. Scroll down and click Reminders. 
3. Choose the My Preferences tab.
4. Put a check mark in the Show Reminders List when opening a Company file. 
5. Go to the Company Preferences tab. 
6. Select those reminders you need based on the one you've set up.
7. Click Ok (see screenshot below).

These resources should get you to the settings you need.

If you have additional questions with the process, please don't hesitate to let me know. I'll be around!