I added many versions of my app at appstore with Utilities as a primary category ,but now I want to add it as Lifestyle category.Can I change this category with out deleting the
You should be able to update the category choices you initially chose during the submission process by logging into iTunes Connect and editing your app.
It's unclear if you have already tried this. I haven't personally tried this in a couple of days, so I'm not sure if this functionality has been randomly removed, but it's certainly worth trying if you haven't already.
You can also change the category when submitting an update to your application, so if all else fails, this is always an option.