Removing individual items from a multi-item field
I'm trying to write a script to perform a search on a set of records which will then remove a particular item from a multi-item field if it is present.
For example the field might be 'Colour' and some records may have multiple items in this field e.g. 'Red' 'Yellow' and 'Green'. How would I remove just 'Yellow' from this field on this record?
I can see how to add text to a field, or how to re-define the fields contents, but can't seem to see how to edit the contents or remove part of the contents.