You can chance decimal places for a currency or quantity by going to Microsoft Dynamics GP -> Tools -> Utilities -> Inventory -> Change Decimal Places
Mark Change Currency Decimal Places, choose the amount of places and select your functional currency ID.
Or mark Change Quantity Decimal Places and choose how many decimal place you would like to have.
Enter ranges for items.
Change Currency Decimal Places will not affect items that exist on any transactions.
Change Quantity Decimal Places will clear the Unit of Measure schedule, price list and purchasing options.