I appreciate you for sharing details, @Abdo Ali. I can help you remove the inventory item.

The steps that you've followed are for the QuickBooks Desktop version. In QuickBooks Online, make sure that there are no associated recurring transactions to the inventory item to remove it. If there are, you can view your Recurring transaction list and delete the template.

Here's how:

1. Click the Gear icon on the top right.
2. Select Recurring transactions.
3. Find the template in question and then click the Triangle button on the Action column.
4. Hit Delete.
   

On the other hand, though we cannot completely delete the item, you can remove it from the Products/Services active list by clicking the Triangle button on the Action column. Then select Make inactive to hide it from the product/services' active list. This will automatically zero out the Starting value of the item.

Here's how:

1. Go to Sales and then select the Products and services tab.
2. Find the item in question, then click the Triangle button.
3. Select Make inactive.
   
4. Hit Yes to confirm.

In case you want to edit item types, take a look at this article to learn more: Change product and service item types. It includes the details on how to adjust inventory items.

In addition, you can restore products and services anytime in QuickBooks Online. Just click the Filter icon in the Products and services tab. Then set the Status to All, hit Apply, and click the Make active option from the Action column for a specific item you want to add back to the active list.

Feel free to add a comment if you need more assistance with deleting some items in your inventory. I'm always ready to help you anytime. Have a happy weekend!