How to return the new object created by linq in a generic func

I have a generic func that takes a string of fields and selects them from an object using linq. However the output is not type of object but a subset of. So to convert this new List<subsetOfOriginal> to a DataTable, I cannot use list.GetType() because it will get me Original.

I have converted

Func<T, T> CreateSelectStatement<T>(string fields)

to

Func<T, S> CreateSelectStatement<T, S>(string fields)

because I don't want TResult to be of type T. Not sure if this is the correct way. This is the code I have at the moment and how it is invoked.

Func<T, S> CreateSelectStatement<T, S>(string fields)
    {
        var xParameter = Expression.Parameter(typeof(T), "o");
        var xNew = Expression.New(typeof(T));
        var bindings = fields.Split(',').Select(o => o.Trim())
            .Select(o => {
        var mi = typeof(T).GetProperty(o);
        var xOriginal = Expression.Property(xParameter, mi);
        return Expression.Bind(mi, xOriginal);
            }
        );

        var xInit = Expression.MemberInit(xNew, bindings);
        var lambda = Expression.Lambda<Func<T, S>>(xInit, xParameter);
        return lambda.Compile();
    }

and then to invoke it I'm using

CreateSelectStatement<SP_ProjectAnalysis_NP, dynamic>(columns)

Expected outcome should be the fields that are loading correctly but the type of the object is as if I used p => new { }. Currently I am getting object as the return type and trying to perform the following gets me 0 properties:

private static DataTable ToDataTable<T>(IList<T> list, string tableName = "table")
        {
            PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));