Group by in Datagrid View

i have a scenario where i have to group the PinCode by city name like one city can have many pincode.

I have to do this in winform in datagrid. How can i do this so in datagrid i can see the + and - on before city.

I thing it can be done by nested grid. please, help.

Column A | Column B | Column C

• Country
  • Почтовый индекс | 10,00 | 15,00
  • Почтовый индекс | 10,00 | 15,00
• Страна
  • Почтовый индекс | 10,00 | 15,00
  • Почтовый индекс | 10,00 | 15,00

Спасибо. Шивам