Let's take 5 minutes to build an order management system using NocoBase.
## 1. Create data collections and fields
In this order management system, we need to have the information of `Customers`,`Products`,`Orders` which are interrelated with each other. We need to create 4 data tables and their fields as follows:
- *Customer* (The customer to which the order belongs to, which is a many-to-one relationship. Each order belongs to one customer, and one customer may have multiple orders)
- *Order List* (The items and quantities in this order are associated with `Order List`, which is a **one to many** relationship. Each order contains multiple order items, and each order items belongs to only one order)
- Order List
- Product (The product contained in this item whith is associated with `Products`, which is a **many-to-one** relationship. Each order item contains one product, and each product may belong to multiple order item)
In this case, for the relationship fields, we have to select the correct type so that we can create the association between the data collections. Let's take `Orders` as an example, create the Customer field and select the **Many to One** relationship to associate to `Customers`.
After creating a relationship field, we can see the automatically generated reverse association field in the Collection being associated. For example, we can see the automatically generated Orders field in `Customers`, so we can call the data of `Orders` in the block of `Customers`.
Once the data collections and fields are created, we start making the interface.
## 2. Configure menus and pages
We need three pages for customers, orders, and products to display and manage our data.
Click the UI Editor button to enter the interface configuration mode. In this mode, we can add menu items, add pages, and arrange blocks within the pages.
NocoBase currently supports table, kanban, calendar, form, items, and other types of blocks that present data from a data collection and allow manipulation of the data. Obviously, customers, orders, and products are suitable for displaying and manipulating in a table block.
We add a table block to the "All Orders" page, select Collection `Orders` as the data source, and configure the columns to be displayed for this table block.
Then, lay out the form blocks on the Products and Customers pages with the same method. When you are done, exit the UI Editor mode and enter the usage mode, and a simple order management system is completed.
