Your products and services didn't go anywhere because you can still locate them in QuickBooks Online, yesenia2. Rest assured that I've got the steps to resolve this.

To start, I'd suggest making sure that you enter the details needed in the Purchasing information section. Here's how:

1. Go to the Gear icon and then select Products and services.
2. Locate the item you created.
3. Under the Action column, click on Edit.
4. Go to the Purchasing information section.
   
5. Place a checkmark on the I purchase this product/service from a vendor box.
6. Enter the other necessary details. 
7. Once done, click on Save and close.

If the details are already entered, I'd suggest logging in to your QuickBooks Online account via a private window. This doesn't use the existing cache files, which makes it a good place to determine if this is a browser-related issue.

Here are the keyboard shortcuts: 

• Safari: Command + Shift + N 
• Google Chrome: CTRL + Shift + N
• Mozilla Firefox or Microsoft Edge: CTRL + Shift + P 

Once logged in, create a purchase order. If all the products show, let's clear the browser's cache. This removes its stored files to ensure the program performs efficiently.

If private browsing doesn't work, I'd recommend using other supported browsers. They'll provide the best and most secure experience with QuickBooks. 

Additionally, I've included these articles that'll help you manage your products and services in QuickBooks Online.

• Get Alerts for Low or Out of Stock Products
• Use Reports to See your Sales and Inventory Status

Please come back and keep us posted on your progress in adding your items to the purchase order, yesenia2. I'm determined to get this resolved.