Increase prices to a group of products added to cart

[adrian]

Hi!

I have different natural wood pieces and offer to apply an enamel coat in different colours.

How can I put  20 different options (each one has different percentual increase for the group of pieces added to cart) ?

EG: 10 different pieces (each one has it Product ID, price, etc) will be painted in one of the 20 available colours. "Red" is 12% more expensive than natural wood, "Green" is 8% more expensive, and so on...

How can I add a seleccion list (at the beggining or at end of the process) so as to increase the total price?? (I need to select the colour for all the pieces in te cart, not individually)

Thanks!