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質問の本質がよくわかりませんが、マッピングクラスで Ignore を使うのはどうでしょうか？
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# 追記
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質問を読み誤っていたようです。
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次のコードの DecodeCsv を使えば CSV を IEnumerable<IEnumerable<string>> に変換できます。これでLINQ を使用して特定のフィールドを読み飛ばし、使用するフィールドを変換するという手もあります。
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```C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text.RegularExpressions;
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namespace Zuishin
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{
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/// <summary>
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/// CSV を解析または CSV に変換する
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/// </summary>
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public static class Csv
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{
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/// <summary>
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/// CSV を解析する
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/// </summary>
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/// <param name="source">CSV の各行を保持する文字列の集合</param>
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/// <returns>解析結果</returns>
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public static IEnumerable<IEnumerable<string>> DecodeCsv(this IEnumerable<string> source)
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{
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const string contentName = "content";
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Regex quoted = new Regex($"^\"(?<{contentName}>([^\"]|\"\")*)\"(,|$)");
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Regex normal = new Regex($"^(?<{contentName}>[^,]*)(,|$)");
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var enumerator = source.GetEnumerator();
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while (enumerator.MoveNext())
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{
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var record = new List<string>();
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string line = enumerator.Current;
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while (!string.IsNullOrEmpty(line))
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{
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Match match;
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if (line[0] == '"')
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{
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do
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{
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match = quoted.Match(line);
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if (match.Success)
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{
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var content = match.Groups[contentName];
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record.Add(content.Value.Replace("\"\"", "\""));
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line = line.Substring(match.Length);
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break;
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}
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if (!enumerator.MoveNext())
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{
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record.Add(line);
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line = "";
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break;
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}
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line += "\n" + enumerator.Current;
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} while (true);
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}
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else
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{
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match = normal.Match(line);
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record.Add(match.Groups[contentName].Value);
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line = line.Substring(match.Length);
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}
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}
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yield return record;
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}
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}
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/// <summary>
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/// CSV を作る
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/// </summary>
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/// <param name="source">元となる集合</param>
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/// <param name="alwaysQuote">true ならば各フィールドをダブルクォーテーションで囲む</param>
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/// <returns>CSV</returns>
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public static IEnumerable<string> EncodeCsv(this IEnumerable<IEnumerable<string>> source, bool alwaysQuote = false)
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{
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var regex = new Regex("^\"|[,\n]");
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string quote(string s)
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{
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return $"\"{s.Replace("\"", "\"\"")}\"";
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}
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string quoteIfNeeded(string s)
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{
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if (regex.IsMatch(s)) return quote(s);
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return s;
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}
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var translate = alwaysQuote ? (Func<string, string>)(a => quote(a)) : a => quoteIfNeeded(a);
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foreach (var record in source)
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{
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yield return string.Join(",", record.Select(translate));
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}
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}
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}
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}
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```
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