Thanks for joining the Community, mirchina-techniu. I'd be more than happy to explain how Spreadsheet Sync works and where it can be found.
Spreadsheet Sync enables you to sync Excel with your books so that data can be pulled into an Excel spreadsheet. From Excel, you can edit spreadsheets and post them back into QuickBooks. You can also create custom reports and new data to post into your books using its list templates.
There's also a couple things you'll want to be aware of when using Spreadsheet Sync: