To do QuickBooks Freshsales integration, you can use a third-party integration tool such as Zapier or Automateio. First, sign up for an account with the integration tool and connect your QuickBooks and Freshsales accounts. Then, create a workflow that specifies which data you want to sync between the two platforms. Once the workflow is set up, the integration tool will automatically sync the data in real-time, saving you time and effort.