I ran into a similar problem. I noticed that you need to provide the full syntax for displaying intellisense
Copy-paste the sample code below and replace it with the source and recipients. Then remove the ".ChildDetails" element samples, you will begin to see intellisense!
Mapper.CreateMap<tblBusinessName, BusinessNameBO>() .ForMember(dest => dest.ChildDetails, m => m.MapFrom(s => s.tblBusinessNameChild));
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