Mobile Event Pad (MEP) allows you to have a library of forms available for events in each occurrence.
Setting up a new form is really easy. Take a look at this article for how to make forms.
Once the form has been published, you'll be able to see it in the Mobile Event Capture app. Here you can use it in an event, or edit the details under the Setup: Forms tab.
Please be aware that while DIY forms do not need re-importing, if you have any managed MEC forms, any changes made to thesewill need to be re-imported as before.