Pass the total from products setup in dropdowns to PayPal payment field.

Is it possible to get a total from products and drop down fields to submit to paypal?  

You can get the total from the products you have setup in your dropdown fields. Please check this guide: https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget 

Then pass the total to your PayPal payment field: https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field 

Let us know if you need more help, we will be glad to assist you.