You have to use the code below. You should set the parent inside the Do. There is a bug in the method you use
var parentID = new Guid("2230ac16-4cd1-4e8f-b45b-51ac13c7c968");
var fluent = App.WorkWith();
Guid DynamicGuid = Guid.NewGuid();
var blog = fluent.Blog(parentID)
bp.Parent = blog;
bp.Title = DynamicGuid.ToString();
bp.Content = "somecontent";
bp.Description = "somedesc";
bp.DateCreated = DateTime.UtcNow;
bp.PublicationDate = DateTime.UtcNow.AddDays(10);
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