No, your configuration will only change moving forward.
Avero loads your data daily, once loaded it is static in Avero. This means your data doesn't change unless we actively reload or receive new data.
You can change an Item Name in your POS and you will see the item number associated with the old item name on reports before the change. The item number associated with the new name on reports will be recorded moving forward. On reports that span both before and after the name change, you will see the item number listed twice with the sales entered under each item name.
Example: I change the name of item 3130 from 'Pumpkin Soup' to 'Mushroom Soup' on December 15. Reports for December 1-14 will show item 3130 as Pumpkin Soup, while reports from December 15 on will show this item as Mushroom Soup. If I run an item-sales report for all of December I will see the sales for both 3130 Pumpkin Soup and 3130 Mushroom Soup.
Categories can usually be changed the same way, but note that Categories are responsible for you item hierarchy and may not be automatically mapped to Global Categories (Food, Beverage, Retail, Other).
Changing Meal Period and Revenue Center names varies by system, some are automatically reflected and some require Avero's intervention to update. To find out the particulars of changing POS System Configuration, visit our POS Integrations Page and click on the name of your system to see our full POS Guide.