Login in to Magento Admin
Go to Products – Catalog From Navigation
Click on “Add Product” drop-down box and select “Grouped Product”
Fill out details of product that is required (* Required Fields). Don’t forget to assign category of product
Go to Grouped products section and click on Add Products to Group
Select product checkbox that you want to add into group after that click on Add Selected Products
After that Save Product by clicking on Save
Finally, you can see your Grouped Product on your store front.