First, it is considered good practice to declare your instance (object) variables as private and encapsulate them in public getter and setter methods. Take a look at your InventoryItm class.
Next, you can use an enhanced for loop (for each loop) like the one you have on line 30 of your Salesmen class to loop through each item in the ArrayList and display and set values using the getter and setter methods you created in your InventoryItm class.
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