Welcome to the Community, @ezz-sarieh. I'm here to help.
To provide the best response, I'd like to gain some insight into your situation. Are you trying to record partial inventory received or are you recording a purchase order? Once I know this information, I'll be able to get you back to business in no time.
I'm here to help you with receiving partial shipment on purchase orders in QuickBooks Online. As long as this Purchase orders feature is turned on, you can receive partial PO's in QBO. The process is easy and simple.
To turn on Purchase orders:
Go to the Settings icon and select Accounts and Settings.
Select the Expenses tab.
In the Purchase orders section, click the pencil icon.
Tick the box Use purchase orders.
Click Save, and then Done.
Once done, you're now ready to receive partial purchase orders in QBO. Here's how:
Create an Expense transaction and manually enter the partial quantity received.
The original purchase order now reflects this.
Once you receive a partial purchase order to reflect the total quantity in QuickBooks, QBO will close the PO and directs you to the link of the expense transaction with which you're able to receive the partial PO. Please note that customizing Purchase Order is only available in QuickBooks Online Advanced version.
I've included additional articles for future reference: