Impulse theme variant image set if option 3 level

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I'm using impulse theme and created variant images sets with option 1&option2. 

I set color and size. And then I set alt text per images.

For example, "title#color_white" according to theme support page,

So I can see the different images per my selection. 

I wanna add option 3 but I don't know how I can make a image set per option 3, bundle type. 

--->>> Option 1 :  color // option 2 :  size // option 3 :  3packs / 5packs/ 10packs


Please help me to solve this problem:) 

Thank you:)