1. Make sure you have already entered in the products you want to group in the Products Tab if not click this link and it will show you how. 

2. Next, select the Group Tab 

3. Select the New Product Group

4. Enter in the given information and select SAVE.

5. Start to add the products you want to group together by selecting ADD PRODUCT and entering the given information.

6. Once all the products are entered you add a picure by selecting the pencil icon then select SAVE and your done! 

Step by step video here: