Creating limited "Select" or "Checkbox" form

Hello,

Would anybody know how to create a limited "Select" or "Checkbox" form when ordering something?

As in: there are 8 options available, but only 4 different options can be shipped, so making that when someone selects one option in the "Select" form, in the following "Select" form, the first option chosen would not appear, or to have a "Checkbox" form that would be greyed out once 4 options have been chosen.