Specify data types
Assign the AutoNumber data type
  1. In the Data Type column beside the Order ID field, click the drop-down arrow.

    When the list appears, click AutoNumber.

  2. In the Description column, type:

    This is the Generic Order ID Number

    then press TAB.

    TIP: Filling in a Description is optional, but it helps you to remember what information is supposed to be stored in a field.