I want to add a discount in invoice and purchase order and 1 inventory not showing in my po

Let's run some troubleshooting steps to isolate why the inventory isn't showing up, Cityconect.

There are instances that an issue like this occurs when the system encounters browser-related issues. To start with, let's open QuickBooks on a private window. It is the best place to identify browser-related issues.

You can use these keyboard shortcuts to open one depends on your browser:

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

If it works, you can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected issues on the system.

You can also switch to a different supported-browser like  Google Chrome, Mozilla Firefox, Safari, or Microsoft Edge.

As for adding a discount on the transactions, we can add another item and then labeled it as Discount. Then, make sure to enter the amount as a negative. I've added this screenshot as a reference:

Also, if you want to add purchase orders to expenses or bills, you can check this reference: Add purchase orders to expenses, bills, or cheques in QuickBooks Online.

I'll be around if there's anything that I can help. Keep safe!