Check Box shopper field when checked extra price will add on cart total

[anil123_singh]

Hello Guys,

I am using vm3 version. I want to show one check box at cart page when check box is checked a particular amount of money will needs to added in the cart.
Please let me know guys how could i achieve this. I create one shopper field which is showing in cart page. I created on custom field too and defines extra price in it. I don't know how to link pricing of custom field and shopper field.

Please help me