Custom Payment Amount from calculaton

Is there a way to use "Get Amount From" to work with " Users can select multiple products" under "Sell Products"?

I need to have Registration product where the cost is taken from a calculation widget. For example:

Membership

     ° Regular Membership,     $100
     ° Medium Membership,     $500
     ° Priority Membership,   $1,000

Registration

     ° Early
     ° Late

The Registration fees will be determined according to membership type and date registering.  Is this something you could implement?

You can just easily recreate your product list as a radio button field, and work the calculation from there.

Then, send the total calculated amount to the custom amount payment field.

Of course, this won't work if you intend the membership payments to be recurring. Unfortunately, that in itself is a dead-end.

Could you explain a little more about how to create the radio buttons? 

Also, how do I add the custom amount payment field into the form? That feature seems to be available only if I have one product - I'll have 2 with sub-products.

The example in my original post was VERY basic. Not sure if you need to know, but this more what the actual product list should look like.

Membership

     ° Regular Membership,           $100
     ° Post-doc Membership,           $50
     ° Tech Support Membership,    $50
     ° Student Membership,            $25
     ° Retired Membership,             $25
     ° Institutional Membership,     $100
     ° Silver Membership,              $300
     ° Gold Membership,               $500
     ° Platinum Membership,       $1,000

Registration

     ° Early
             ° Gold Level Member
             ° Platinum Level Member
             ° Student Member
             ° All Other Members
             ° Non-members
     ° Late
             ° Gold Level Member
             ° Platinum Level Member
             ° Student Member
             ° All Other Members
             ° Non-members

We would like to see something like this on the PayPal page:

http://www.jotform.com/help/183-Difference-Between-PayPal-PayPal-Pro

Hi,

Also, how do I add the custom amount payment field into the form? That feature seems to be available only if I have one product 

This is correct. The Custom Amount Payment is good only for one.

But what our colleague NeilVicente was suggesting is just using the regular Radio Option button(found in Form Tools) to create all the products, then do calculation for them, and then theTotal Amount of the calculation can be passed on to the paypal Custom Amount Payment tool (only the Total Amount.. so it is only one)

Review this user guide also -How-to-pass-a-calculation-to-a-payment-field

Here is an example form you can check http://www.jotform.me/form/41486574533461

I have added calculation value to the property of Radio option like this 

so that it can be calculated.

I am not sure how intend to apply the Early/Late option, but I assume it will be base on date of registration.  You can add a date field then create condition rules that can compute the total amount base on the date of registration.

Hope this help. Inform us if you need further assistance.

Thanks!