To insert a new stock item press the [Insert] key while in stock grid or click the button from the buttons bar.

To change a field value, double click on the field to switch it to edit mode or just type the new value and press [Enter] to validate.
The cursor will move to the next field.

Alternatively, you can edit stock details by clicking the edit button on the left of the item name.

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Please note that the material list will contain only those materials that are present in the Materials list. Smart2DCutting manages different material panels and parts based on this field. If you don't plan to use different material panels and parts you can leave this field empty all the time.

Important: Please make sure you enter the same material string for panels and parts with the same material type or you will not get the expected results. The best practice is to add the material type to the Materials list and then select it from the drop-down box for each panel or part.
Even the smallest difference between 2 material strings will cause the program to treat them as different materials. For ex.: "MDF 18mm" and "MDF 18 mm" are considered different material types by the optimization engine.