Можно ли создать массив словарей

Dictionary<string, List<string>> D1 = new Dictionary<string, List<string>>();

Dictionary<string, List<string>> DimensionKey = new Dictionary<string, List<string>>();
...
comboBox1.DataSource = new BindingSource(DimensionKey, null);
comboBox1.DisplayMember = "Key"; //отображение ключа
foreach (string Var in DimensionKey.Values)
{
    comboBox2.ValueMember = "Value";
}

List<string> Dim1 = new List<string>();
Dictionary<string, List<string>> DimensionKey = new Dictionary<string, List<string>>();
 
if (cellTextRow != "")
{
     Dim1.Add(cellTextRow);
}
DimensionKey.Add(cellTextCol, new List<string>(Dim1));
Dim1.Clear();
 
...
comboBox2.DataSource = new BindingSource(DimensionKey, null);
comboBox2.DisplayMember = "Key";
...
 
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            comboBox5.Items.Clear();
            foreach (var item in DimensionKey.ElementAt(comboBox2.SelectedIndex).Value)
            {
                comboBox5.Items.Add(item.ToString());
            }
            comboBox5.SelectedIndex = 1;
        }