Yes, you can use an incline treadmill for walking. In fact, many people find that walking on an incline is a great way to get a cardio workout without putting too much stress on the joints. If you're new to using an incline treadmill, start with a low setting and gradually increase the incline as you build up your endurance.
If you intend to walk on your future treadmill, it’s worth reading the best treadmills for walking.