Variable Price

I am trying to setup a system to allow users to upload flyers.

They have an option of 1-sided and 2-sided flyers, the quantity of flyers, folding and e-proofing.

The pricing of folding is variable depending on the number of flyers being printed and the pricing for e-proofing is variable depending on whether the flyers are 1-sided or 2-sided.

For example: If a user selects they want folding the pricing for quantity will increase for each quantity level.

Is there a way to set up this type of variable pricing.

Is there a particular hook or filter I can utilize to manipulate the price?

How can I use gform_field_value_$parameter_name to dynamically fill the values for a multiple choice price option field?

All the examples I can find of gform_field_value_$parameter_name are using single value form fields. How do we use this to fill a multi-value form field like a multiple choice or dropdown-box.

Did this thread ever get resolved ?

i have a form that i want to populate with dynamic values depending on the product chosen is there a way to do this ? It includes over 10 select drop downs and would need each one to use pre defined values pulled from a wordpress page with php ? Can i pass the php variable to gravity forms on a per product basis so essentially dynamic and updatable by the client at the back end ?