I wish people to tick boxes in a hierarchical taxonomy, within a form that they could access from a WordPress site. 

I would already have the same hierarchical taxonomy set up in the backend of the WordPress site. 

So I seek help with: a) creating hierarchical taxonomy in the form; b) integrating users' selections in that form to the equiavlent taxonomy in WP backend.  Assuming that to be possibe I'd be interested to know how much the assistance would cost.

Thanks!