I worked there a few years ago and this was not done.
You could go in store and use the display computers (highly do not recommend). but at that time they did not have a service for you to make an online order in person.
All you can do is order online, then pick up in store... IF that item is available in the store. If I remember right, certain items that were online only and not even sold in store were not able to be picked up.. In other words they didn't ship the item to the store for you to pick up.