How can I add a dropdown field on the Infinite List Widget?

thanks for your above help.. i have decided to use "INFINITE LIST WIDGET" instead the above mentioned, since applying my kind of formula calculation for creating a VOLUME TABLE seems a bit impossible to conclude as per your info..

though, i need some help from your side using "INFINITE LIST WIDGET"... i`m no IT guy or a web master, i`m just using my common logic trying to build a website with user friendly forms to fill in... is it possible to help me out and apply a drop down list instead a fill in box for the first box on the left "Type of Package" in the below "INFINITE LIST WIDGET" i cannot get a grip on how to use Custom CSS, so your kind help is appreciated..

thanks, jeff 

The Infinite List widget is for Text Boxes, in this case the Configurable List widget would be perfect to add a Drop Down field:

Let us know if you need more help, we will be glad to assist you.