Hi again, @GeorgeIoak.

Thank you for getting back for additional support. You have a lot of options in assigning a different cost for the items in QuickBooks Desktop.

• You can follow the steps I've provided and assign a specific amount. Then, create a different item again with specific cost.
• You can leave the cost field zero. This way, you can manually enter an amount when you create a sales transaction.
• You can create an assembly item and assign a cost amount. This allows you to sell a collection of products and services together. 
• You can also use our Advanced Pricing feature. This allows to changes the prices of items on sales forms according to rules you create. Each price rule can contain multiple conditions that must be met before QuickBooks Desktop changes the sales price.

Let me know which option you prefer, GeorgeIoak. I'm still here to offer my assistance. You can always mention my name again. Have a wonderful day ahead!