If you have only one table then your data structure is probably not normalized. If you expect repeat customers then you need a table of customers and table of orders (maybe another table for order details and maybe a table of products). Use form/subform arrangement. Main form bound to customers and subform bound to Orders. Go to an existing customer, or add new customer, on the main form and enter their order info in subform.
Or
Have main form bound to Orders and select customer in combobox, subform bound to OrderDetails. Enter products ordered in subform.
1. An autonumber type field can accommodate generation of unique ID. Here is one way to filter form:
http://datapigtechnologies.com/flash...tomfilter.html
2. You have a lot to learn before tackling something this advanced. Review:
https://www.accessforums.net/access/...ils-36702.html