You want to create your own article group. In reality, this is not possible in Winner Design. However, there is an alternative that is to rename an existing group of items that you don't need.
From version 12.3a4 there is a new item group Other Services which will be exempt to discounts applied. This is for when you need to add services into your quotation such as fitting that you would not want discounts applied to.
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Click on Global settings in the menu bar and select System Settings.
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Click the Item groups tab
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Choose the Item group that you do not use, whilst taking care of how it works regarding the selected VAT profile.
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Having made your choice, rename the selected Item group by changing its name in the Printname column.
Note: The Item Group, Other Services will be exempt from discounts applied to the quotation.