About The Product Sub-Options

Hi friends, instead of drop down to the products while offering the option I want to use check box. so customers will be able to make multiple selections instead of individual choice, Is there a friend will help

This is not easily done due to the way the cart function matches the values. It expects only 1 option value per option category.

Color:
- Red
OR
- Blue
OR
- Green

AND

Size:
- Small
OR
- Med
OR
- Large

The post back looks for "Option1=Value" so there would need to be big changes for it to support multiple
However,
you could do it if you only make one option value per option. Even if you set them to the same name. You'd have in the backend
Option 1 - Color: RED
Option 2 - Color: BLUE
Option 3 - Color: GREEN

This way, although they are displayed as the same type of option, they are actually different options for each.
Then if you strictly stick to this method you could change the front end to use checkboxes instead of select box.