❔ EF inheritance, selecting from multiple children

ProcessSpec parent:
public class ProcessSpec : SpecBase
    {
        public ProcessSpec()
        {
            ProcessSpecDosimeterLoadings = new List<ProcessSpecDosimeterLoading>();
            DosimeterLoads = new List<DosimeterLoad>();
        }

        [Key]
        public int ProcessSpecId { get; set; }

        [MaxLength(255)]
        public string ProcessSpecName { get; set; }

        public int TreatmentSystemId { get; set; }

        /// <summary>
        /// Describes this process spec
        /// </summary>
        [MaxLength(255)]
        public string Description { get; set; }
}

inheritance 1:
public class ProcessSpecGamma : ProcessSpec
    {
        /// <summary>
        /// Refers to the density (in g/cm³) of the minimum density to be used in the process.
        /// </summary>
        [Column(TypeName = "decimal(18,3)")]
        public decimal? MinDensity { get; set; }

        /// <summary>
        /// Refers to the density (in g/cm³) of the maximum density to be used in the process.
        /// </summary>
        [Column(TypeName = "decimal(18,3)")]
        public decimal? MaxDensity { get; set; }
    }

ProcessSpec parent:
public class ProcessSpec : SpecBase
    {
        public ProcessSpec()
        {
            ProcessSpecDosimeterLoadings = new List<ProcessSpecDosimeterLoading>();
            DosimeterLoads = new List<DosimeterLoad>();
        }

        [Key]
        public int ProcessSpecId { get; set; }

        [MaxLength(255)]
        public string ProcessSpecName { get; set; }

        public int TreatmentSystemId { get; set; }

        /// <summary>
        /// Describes this process spec
        /// </summary>
        [MaxLength(255)]
        public string Description { get; set; }
}

inheritance 1:
public class ProcessSpecGamma : ProcessSpec
    {
        /// <summary>
        /// Refers to the density (in g/cm³) of the minimum density to be used in the process.
        /// </summary>
        [Column(TypeName = "decimal(18,3)")]
        public decimal? MinDensity { get; set; }

        /// <summary>
        /// Refers to the density (in g/cm³) of the maximum density to be used in the process.
        /// </summary>
        [Column(TypeName = "decimal(18,3)")]
        public decimal? MaxDensity { get; set; }
    }

inheritance 2:
public class ProcessSpecBeam : ProcessSpec
    {
        /// <summary>
        /// 
        /// </summary>
        public ProcessSpecMevex()
        {
        }

        /// <summary>
        /// Specifies the type of ProcessSpec, including the form configuration.
        /// </summary>
        public int? ProcessSpecTypeId { get; set; }

        /// <summary>
        /// Specifies which label option will be used by this Process Spec.
        /// </summary>
        public int? LabelOptionId { get; set; }

        /// <summary>
        /// Specifies the orientation of the barcode on the label.
        /// 
        /// Note: Perhaps this could be added to Shipper or LoadingPattern?
        /// </summary>
        public int? BarcodeOrientationId { get; set; }

        /// <summary>
        /// Specifies whether the carrier dimensions will be used for the process.
        /// </summary>
        public bool UseCarrierAssociations { get; set; }
}

inheritance 2:
public class ProcessSpecBeam : ProcessSpec
    {
        /// <summary>
        /// 
        /// </summary>
        public ProcessSpecMevex()
        {
        }

        /// <summary>
        /// Specifies the type of ProcessSpec, including the form configuration.
        /// </summary>
        public int? ProcessSpecTypeId { get; set; }

        /// <summary>
        /// Specifies which label option will be used by this Process Spec.
        /// </summary>
        public int? LabelOptionId { get; set; }

        /// <summary>
        /// Specifies the orientation of the barcode on the label.
        /// 
        /// Note: Perhaps this could be added to Shipper or LoadingPattern?
        /// </summary>
        public int? BarcodeOrientationId { get; set; }

        /// <summary>
        /// Specifies whether the carrier dimensions will be used for the process.
        /// </summary>
        public bool UseCarrierAssociations { get; set; }
}

BaseDbContext:
public class BaseSpecificationContext : BaseContext
    {
        public BaseSpecificationContext(IConfiguration configuration) : base(configuration)
        {
        }

        public BaseSpecificationContext()
        {
        }

        public DbSet<ProcessSpec> ProcessSpec { get; set; }
}

DbContext 2:
public class SpecificationContext_19 : BaseSpecificationContext
    {
        public SpecificationContext_19(IConfiguration configuration) : base(configuration)
        {
        }

        public SpecificationContext_19()
        {
        }

        public new DbSet<ProcessSpecMevex> ProcessSpec { get; set; }
}

BaseDbContext:
public class BaseSpecificationContext : BaseContext
    {
        public BaseSpecificationContext(IConfiguration configuration) : base(configuration)
        {
        }

        public BaseSpecificationContext()
        {
        }

        public DbSet<ProcessSpec> ProcessSpec { get; set; }
}

DbContext 2:
public class SpecificationContext_19 : BaseSpecificationContext
    {
        public SpecificationContext_19(IConfiguration configuration) : base(configuration)
        {
        }

        public SpecificationContext_19()
        {
        }

        public new DbSet<ProcessSpecMevex> ProcessSpec { get; set; }
}