Very easy, if you use the Excel export/import option! If you need to make updates, simply update your Excel template and import the updates.
Select Surveys
Click on the survey to navigate to the survey set up wizard
Navigate to the 'Questions' section
Option 1:
Export the Question file from the survey (Surveys - Click on survey title - Section 2 for Questions)
Retain the question ID and key terms exactly as they appear
Only delete the question ID if you are updating the corresponding question text
Update the category title to reflect the preferred category you'd like shown in the insights
Save the file
Select import to import the updates to the survey
Don't forget to Save on the questions page!
Option 2:
Select the Edit icon beside the question whose category you'd like to update
From the Category drop down, select the category you'd like the question to be associated with
'Save' the edit question module
'Save & Continue' on the primary Questions page