I'm glad to help you find a suitable Warehouse Management System that can be integrated with your QuickBooks Online (QBO) account, Support-itevalut. 

To begin, it's best to look into third-party apps that offer Warehouse Management Systems compatible with QBO. These apps can help you manage your inventory, orders, and shipments more efficiently.

Find an app in product

1. Sign in to your QuickBooks Online account.
2. Select the Apps tab on the left navigation bar.
3. Search for the app you wish to connect to in the magnifying glass bar or select the Browse category ▼ to search for an app by category.

Download an app

1. Select the App you wish to download
2. Select the Get App Now.
3. Authorize the app to connect to your QuickBooks Online.
4. Follow the remaining steps to connect and set up the app settings of your choice.

I'll also include this helpful resource for more information and a tutorial clip on this process: Integrate apps in QuickBooks Online. 

Furthermore, here's an article for future reference if you want to disconnect an app: Disconnect an app in QuickBooks Online and QuickBooks Online Accountant. 

Don't hesitate to reply to this thread if you need further assistance on third-party apps or have any questions about QuickBooks. I'll be here to assist you. Have a good one.