change section of the form depending on answer

How do I use the same form for different clients but I will need to change a section for the treatments that client will have

You may use conditions to show/hide different fields in your form based on the answer.

Here is a guide:https://www.jotform.com/help/316-how-to-show-or-hide-fields-base-on-user-s-answer

Please check it out and let us know if this fits your requirements.