You can use new adjustment for changing on hand amounts after physical count. Click on the button New at the Adjustment list form.
You have to select Location where you adjust inventories. You can define Department if your count only part of your warehouse. You will see the list of all products with On Hand amounts. You have to enter real quantity of products in the column New Quantity. Program calculates Difference between expected and real on hand amounts. Click on the button Save and program will create receipt with difference amounts. This receipt adjust inventories to real amounts.