If you have a Set Menu(promotion package or something else) you just combine the other item to make as Set Menu.

So, here the instructions:

1. Add your menu first

2.  Then, click at SET MENU – B(that item) then click +Add Menu

3. After the switch to Add Menu Item and key in the details then click Submit button

4. Just key in the other items

5. Update Settings at your iPad. It will be like this: