query.GroupBy(q => new { q.Year, q.Month })

    .Select(q => new

    {

        Year = q.Key.Year,

        Month = q.Key.Month,

        BuildAmount = q.Sum(i => i.BuildAmount),

        RecAmount = q.Sum(i => i.RecAmount),

        Amount = q.Sum(i => i.Amount),

        RealAmount = q.Sum(i => i.RealAmount)

    });

where.GroupBy(x => new { }).Select(q => new

                {

                    sumWeight = q.Sum(x => x.Weight),

                    sumQuantity = q.Sum(x => x.Quantity),

                    sumIncome = q.Sum(x => x.Income)

                }).FirstOrDefault();