When you configure records for Data type, a new data page will be created. For ex, when records are configured for the "Address" data type a new Data page "D_AddressList" will be created. The data page gets the list of records available in Data type.
If you want to show the records of this data type in Work, use Table layout and source it with the Data page. Please find below screenshot for more details.
If the customer is a pagelist, you can use the table layout and source as "Property" and give ".Customer" in theList/Group.
If the customer is a single page, then create a section in the customer class and map all the properties. In the main section, do a section include and use the page context as clipboard and context value as ".Customer"