I want to delete all my inventories and the right amount. How i can do that?

Glad to have you here in the Community, @laiden22 

Thanks for checking this with us today. I can help you remove your inventory items in QuickBooks Online (QBO).
 

Currently, the option to completely delete inventory items still isn't available in QuickBooks. Good thing, QBO has a Batch action feature that allows you to make your items inactive in just a snap. Let me guide you through the steps:

1. Tap the Gear icon.
2. Select Products and Services.
3. Mark the items you'd like to remove.
4. Hit the Batch actions drop-down.
5. Choose Make inactive.
6. Click Yes to complete the action.
    

Also, we can manually adjust an item's quantity without recording a purchase or sale, to match what you actually have in stock (if you track inventory in QuickBooks Online Plus and Advanced). Here's how:

1. Click the + New Plus icon. 
2. Select Inventory Qty Adjustment.
3. Enter the Adjustment Date.
4. In the Inventory adjustment account drop-down, choose the appropriate account.
5. Select the products in the Product field. The description and current quantity on hand auto-populate.
6. Enter either a new quantity or a change in quantity for each item. 
7. In the Memo field, enter the details about the adjustment.
8. Press Save and close.

You also have the option to restore deleted products or service items. Please check out this article for the complete steps: How to edit, delete, and restore list elements.

Please feel free to post any other questions you have below. The Community and I are always here to help you out.