Every row must start with a unique column called Key. For example for Postal Area this would be 'SW' or 'HG'.
A Key is unique so should appear on only 1 row. If it is a Postal Area file then there should not be more than one row with a key of 'SW'.
Do not mix area, districts and sectors together. A file should only contain data for 1 level.
If there is a label column then it must appear after the key and before any data columns.
If present then it must be called 'Label' otherwise the system will try and plot it as data.
It will be ignored by the system when uploaded, so it is purely for your own use.
You can add your data columns to the right of the key and label columns.
Make sure that each column has a unique name and is not called 'Key' or 'Label'.
Ensure that the data for each field is enclosed in quotes (otherwise commas in formatted numbers/currency may corrupt the file)
Format any numbers prior to uploading. If you want numbers to 2 decimal places then make them 2 decimal places in the file.
Any of the numeric fields/columns that you add can be plotted on a map.