I appreciate you posting here in the Community.
I'm here to provide the steps to ensure you can increase the selling price of stock items in QuickBooks Online (QBO).
We can update the selling price by exporting the product and services changing the pricing and importing it back to QBO. However, since you've mentioned that it'll be 5000 items, you might need to split it into a multiple Excel file since the limitation is only 1000 rows.
Here's how:
Once done, you can edit the pricing to Excel and import it to QBO.
Also, you can create and define each specific item price you charge or sell to your customers. For detailed information, I suggest following this article on how to add products and services, track the items you sell, as well as how to edit them: Mange Products and Services List.
In addition to that, I'll be sharing this link to help manually apply a discount to one or more items on your sales forms: Add a discount to an invoice or sales receipt in QuickBooks Online.
Fill me in if you have other questions about managing your stock items in QuickBooks. I'll be happy to help again. Stay safe!
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