select multiple & show both contents

select multiple & show both contents

hi

there are multiple items in the Products, when I select one, it shows the data of that related products, but when I select both, it suppose to show both data in the field. but its not doing it. 
let me tell you more about it. 
when I select EZSpeed, then it shows Type, then from there I can choose New/Repair/Both. 
I want to select both from the products (EZSpeed & EZEnergy), & then it should show me New/Repair/Both, & from there if I choose New, its should show me all the new products from EZSpeed & EZEnergy. same as for Repair & Both. 
I am not sure how to do that. 
right now, if I select both of them, it just shows me the data from EZSpeed.