DropDown Menu and adding items…

Hello,

I am developing a drop down menu which will go if one selects ‘Cars’ from the first website :

FIRST DROPDOWN
cars $4
trucks $4
planes $4

SECOND DROPDOWN
car 1 $6
car 2 $6

THIRD DROPDOWN
colour 1 $2
colour 2 $2

‘ADD TO CART’

I would really like if there is some code out there to allow it to to add these items together in the end and display them and the total cost at the bottom of the webpage once I click ‘Add to Cart’.

Can someone please help me out with this, even with a link for a site that gives more info on it,

Many thanks!!

Also in #JavaScript _↴