Magento Tier Price Extension will allow you to display the quantity of tier price in the dropdown.

Magento Custom Options Absolute Price extension lets you add absolute price and one-off charges with custom options.

Magento Reviews Import Extension by MageComp allows the store owner to import and export for bulk store products by importing CSV file from the backend.

Magento Order on WhatsApp Extension by MageComp allows store customer order and resolve their pre-purchase query using a single button click over WhatsApp.

Magento Product Questions extension help store customer ask their product questions right from the frontend product page.

Magento Custom Order Number Extension let store owner set their own order number starting range of instead default Magento 100000001.

Magento WhatsApp Share facilitates sharing and promoting product details through WhatsApp messaging app and Whatsapp Web just with a finger touch.

Now restrict your customer to purchase your group product in minimum quantity.