Is there any feature avail like Buy Product with optional product

[mani313]

hi there,

 

 i could not explain my question in tilte. actually in our shop i want give optional product when buy buying a product.

 

for example : mobile phone ($100) + memory card ($2) = $102 , but quantities should not differ with memory card without memory card if few products bought.

 

i tried with 'product combination' Memory card : yes / no (selection) but quantities relay on each combination value. 

 

 

how do i overcome this issue or any other feature to buy optional product ?