Units of measure in QuickBooks are an essential feature for many users. QuickBooks can convert and track if you buy by the gallon and sell by the ounce, buy by the case and sell by each unit etc.
Custom Fields in QuickBooks allow you to enter and track unique information on both sales forms and reports. Custom fields allow you to add information such as customer level, product color and more to invoices, forms and reports. Custom fields can be added to names records such as customers and vendors and also to inventory and service items. If you add special information to the top portion of invoices, you would create a custom name field.