I have a form question.
I have a series of options for roof sizes, for example:
Size Price
2000mm x 2000mm £1,000
2000mm x 2500mm £1,500
2000mm x 3000mm £2,000
Then I need to sell glass for the roof but this is sold by the square Metre m2 and I have 5 different options for glass at different prices.
So my 2000mm x 2000mm roof size would be 4m2
How could I make it so that when someone chooses an option for roof size (example option one 2000mm x 2000mm) it automatically calculates the amout of glass needed (in m2).
then when they choose an option for glass it multiples the m2 by the price per m2 and adds that total to the final total.
I hope that makes sense!
Kind regards
John