Hi there, @Caio_ls. I understand how crucial it is to keep your inventory details. I'm here to add information about the QuickBooks Commerce discontinuation and how you can add your inventory to QuickBooks Online. 

QuickBooks Commerce will remain accessible until the end of your payment period. This is why your getting a message that your cancellation schedule will be on July 29. With that said, I recommend you export all your QuickBooks Commerce data in bulk using the Data Exporter tool. Feel free to follow these steps to access the tool.

1. Sign in to your QuickBooks Commerce account. 
2. Go to the Gear icon and select Data Exporter.
3. Select Export Account Data.
4. You'll then get a pop-up message that says the export has started in the background. Refresh the page to see the status of the export.
5. Once the status is updated to Complete, select the export row (s) to see a list of the download links. 
6. Links to download the exported data expire seven days after generating the export. You can still generate a new export to get new links.

For more details, please read this helpful reference: Data Exporter Guide - QuickBooks Commerce Offering Discontinuation.

Once done, you can set up inventory items in your system and import your QuickBooks Commerce data to QuickBooks Online. Before that, you need to enable the feature through the Accounts and Settings page. Make sure to open your account as an admin, then follow these steps:

1.  Go to the Gear icon, then click on Account and Settings.
2. Tap on the Sales tab.
3. Select Edit in the Products and Services section.
4. Turn on Show Product/Service column on sales forms.
5. You can also turn on price rules if you want to set up flexible pricing for the things you sell.
6. Turn on both Track quantity and price/rate and Track inventory quantity on hand.
7. Hit Save, then Done.

For more details on importing your data,  refer to this article: Import products and services into QuickBooks Online.

On the other hand, you can use your reports to see your sales and inventory status. 

 If you have other questions in mind while working with your products and services, let me know by leaving a comment below. I'm more than happy to help you again. Have a good one!