The point of it
This section helps you for example group different newspaper names under one head. There may be various different spellings for the same news source: the idea is to clean things up by standardising. E.g. you find you get
GUARDIAN
GUARDIAN.CO.UK
THE GARDIAN
THE GUARDIAN
GUARDIAN (LONDON)
and want these to be simply GUARDIAN.
How to do it
Press the Load publications button to see which publications were recognised. Drag any needing grouping to the Entries to be grouped box.
and press Add: