The best way to maintain an accurate inventory is to continually count your inventory. That is, count part of your inventory every day, and count each item several times per year.
Create a Stock Count Schedule (Transactions >> Inventory >> Stock Count Schedule)
Complete and post a Stock Count Entry (Transactions >> Inventory >> Stock Count Entry)
There are a variety of ways to create a Stock Count Schedule. You will want to use the “Mass Add” feature on the Stock Count Schedule screen. I’m guessing these are the three most popular ways to select items to include on the Stock Count Schedule:
ABC Code (Run the ABC Wizard to assign codes to items: Tools >> Routines >> Inventory >> Item ABC Analysis)
Next Stock Count Date (Set up the Stock Calendar: Tools >> Setup >> Inventory >> Stock Calendar, and assign the “Next Count Date”: Cards >> Inventory >> Count Cycle Assignment)