@Leanne Monter may I know what exactly you are trying to modify? Could you please add your use-case for better understanding. 

@sai_ram We are modifying some of the questions/answer choices and adding some new questions.  

@Leanne Monter  I think much of that is personal preference. If you are making minor changes (say, wording or spelling on a couple of questions) pausing likely makes sense. But if you are making more substantive changes, such as new questions or question/answer pairs I would consider a new survey.

It will be easier to track when the change was made, so you know if a participant didn’t answer a question because it wasn’t available at the time, or because they didn’t wish to answer/select that answer. Additionally, you’ll likely have less problems looking at old survey data with a bunch of new questions or options that weren’t available when it originally went out.

For reporting, you could easily make a report on flattened surveys or survey IDs and just filter to the old and new IDs.

@Leanne Monter did you get a chance to view the comments posted by @bradley. 

@bradley Thanks for your time here!

@sai_ram Yes we are just going to create a new survey.  Thanks!