you can - but you're better off keeping them separate.
your savings wallet should be far away, and on an encrypted partition.
if you keep the two together, they are each as vulnerable as the other. i don't mind having a 5-10 BTC wallet on my phone or on my day-to-day computer, exposed to the 'net. but my savings wallet? nope.
Understood. Then my real question would be: how do I create a new wallet to be used with the same client?
Thanks for your time.