You can refresh all of your accounting reference data in Lightspeed Accounting at:
Settings>Accounting>View Details (if you have more than one location)
Press the Refresh Reference Data button.
This will refresh reference data only and has no impact on syncing sales data.
For QuickBooks Online and Xero, the refresh will be immediate and you can simply go back to Settings > Account to refresh the data in your browser session.
For QuickBooks Desktop, this will issue a command to your QuickBooks to send updated reference data back to Lightspeed Accounting. You can do this immediately by updating your Web Connector process.