To create a new fact box in a Page in NAV using VS Code about al HOT 2 CLOSED

// The factbox part that should be added
page 70040000 MyOwnFactBox
{
    PageType = CardPart;
    SourceTable = Item;

    layout
    {
        area(Content)
        {
            field(Desc;Description) {}
        }
    }
}

// Page extension adding "MyOwnFactBox" to the Customer Card
pageextension 70004001 MyExtension extends "Customer Card"
{
    layout
    {
        // Add changes to page layout here
        addfirst(FactBoxes)
        {
            part(MyFactBox;MyOwnFactBox)
            {

            }
        }
    }

    actions
    {
        // Add changes to page actions here
    }
}