You can load customers into a combo box and then with an AfterUpdate event fill in whatever information you want into a different form. This is a little more advanced. I cover it in Access Expert 22. We copy product detail into the order form, but it's the same concept. Here's another video that might help you: AfterUpdate and Dlookup

Now as far as having the database "recognize" them, how do you want to accomplish that? Just pick the customer yourself, or actually have the database count how many orders they place and make a list sorted by popularity? DCOUNT if that's the case.