Inventory adjustments are made from the Inventory Main Menu:
Click on Enter/ Update-Sales /Purchases /Adjustments
Make sure all Purchases are posted and cleared first before any adjustments are made.
Once you have entered the model part #, adjust +/-1 in quantity only (no $$$ required) to make Suburbans count match hand count.
On the Inventory Main Menu choose Post Inventory and enter the WS ID to post the adjustments. This is similar to how you post Purchases.