can i do a required field as one of 2 or more as the required?

can i make 2 or more fields and make that if one of them is filled then the other ones aren't required?

It depends on the type of field you are using. If you are using check-box fields you can set up the minimum and the maximum number of selections:

You can check this form that has a check-box required field that needs 3 options to be selected so the form can be submitted:

http://form.jotformeu.com/form/41674567180359

Is this a solution for you? If not please provide us the form's url and the type of field in which you intend to implement this solution.

Thank you.