MicroSale can be set to force all items to resend to the kitchen/bar every time a new item is added to the check.
Managers Menu > Register Setup > Terminal Configuration > Register Options > Printing / Cash Drawer > Advanced Options
Option is not set by default.
[Option Name] Resend the complete order every time: anytime an item is sent to the remote printer, all other items that went to the printer prior will print as well.