Product Grouped can addable the products other on a product page.
To create a product page and be able to display more such other products. You need to follow these steps:
1 - Go to a product page available, copy name of that product.
2 - Go to Online Store > Navigation select Group Menu.
3 - You need enter fill these sections: Title, Handle & Menu Item, then click Save.
Go to Products -> Choose product just have added > CLick to View To see the result: