In Crystal Reports XI:

  1. Go to Database > Verify Database
  2. Go to View > Field Explorer
  3. Click "+" next to the Database Fields
  4. Click "+" next to the table that contains the needed field
  5. Using the mouse, click and drag the field from the Field Explorer window to the desired section of the report

In Crystal Reports 8.5:

  1. Go to Insert > Field Object.
  2. Click "+" next to Database Fields
  3. Click "+" next to the table that contains the needed field
  4. Using the mouse, click and drag the field from the Field Explorer window to the desired section of the report.