How do I Add Items on Paypal Field using Condition Logic

for my form https://form.jotform.com/53172320345244 ... i want place a requirement on some parts of the form. for example, if you dropdown menu (univeristy #2) is filled then ADD UNIVERSITY #2 in the paypal plug in would be a requirement ?

Using Conditions only is not possible to make an individual items/products become  required/unrequired or be added dynamically to the Payment field.

What you may want to try to achieve a similar thing is to use Sub-Products option instead on the Payment field.

user guide: -Create-Sub-Products-Based-on-a-Product-Option

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I will create a demo form that shows the idea so you can check. I'll get back to you shortly. 

Here is the demo form https://form.jotform.com/53306307032948?

I used Sub-Products and Special Pricing option

so it works like this

Hope this help. Let us know if you need further assistance.