IncludeBase.cs

void Main()
{
	Mapper.CreateMap<Source, DestinationBase>().ForAllMembers(e => e.Ignore());
	Mapper.CreateMap<Source, Destination>().IncludeBase<Source, DestinationBase>();
	Mapper.Configuration.Seal();
	
	Mapper.AssertConfigurationIsValid();
	
	Mapper.Map<Destination>(new Source { Value = 3 }).Dump();
}

public class DestinationBase
{
    public int AnotherValue { get; set; }
}

public class Destination : DestinationBase
{
    public int Value { get;set; }
}

public class Source
{
    public int Value { get; set; }
}