You can create the two section in a form and export it. Use this exported form as a template and add other controls as needed.

Thanks Sojan

Will all the forms be updated if we make changes in the layout after creation of forms?

Also, what if i need to change the layout of forms i.e in some forms the common section will be on top and in some they can be at bottom. Also if i just need one of the generic section in one form and want to include all generic sections in other form.

Is there no way to just create these generic sections and add one/many of them in a form when required as the structure of the forms can be different as per my project requirement

In my opinion the forms won't be updated automatically. To export and import the forms is just a workaround to reduce your effort in form creation.

I suggest you to write a common script that will render your section on all forms.

In that way you can make changes on your script/section that will be common for all your forms without the need of publishing or modifying individual forms.

Thanks Fernando,

Can you elaborate what kind of script  is required to render Nintex controls.

I need to add nintex controls/ sharepoint columns in the sections. i am using jquery to call external webapi to prepopulate some of the fields.