You may wish to use the field information in one Datasource to link to another Datasource to retrieve information; we call this “piggy backing”. Following are a couple of scenarios detailing how this may be used.
Other examples may be to use the UPRN of a property, find the Ward area that it is in and then link that to Census data or Election results. Once you know the street where the property resides you may wish to find out details about the street using the USRN and accessing data such as Parking Restrictions for example.
In order to create a “piggy back” you have to first define each of the individual Datasources as previously described making sure that you select all the relevant fields that you will need to use for linking. Once you have done this you can then cross reference these Datasources.