I'll provide the two options to help achieve your goal, @may0927. 

If you're using QuickBooks Online (QBO), let's use the Advanced Search feature to delete an inventory adjustment. I'll guide you how. 

1. Go to the Search icon on the toolbar.
2. Select Advanced search.
3. Choose Inventory Quantity Adjustment from the All Transactions drop-down list. 
4. Set the other filters. 
5. Click Search.
6. Select the transaction. 
7. Click Delete at the bottom of the screen. 

The screenshot below shows you the last step. For the detailed instructions, check out this article: Edit Or Delete An Inventory Quantity Adjustment. 

You can also run reports to view your sales, cost of goods, and inventory status in QBO. 

If you're using QuickBooks Desktop (QBDT), deleting an inventory adjustment is currently unavailable. I'd suggest performing the workaround provided by LieraMarie_A above. 

In the meantime, I recommend going to the Help menu and select New Features. Then, choose either of the two options from the list (see the screenshot below). This way, you can keep track of our product innovations. 

Lastly, you can run the Inventory Valuation Summary report to ensure your inventory status is correct. For more details, see Step 4 through this article: Adjusting Inventory Quantity Or Value In QBDT. 

Click the Reply button below if you have other concerns. The Community and I will be around to lend a helping hand.