TOPIC:

I need some additional fields for the link options:

#choose an article (pull-down that accesses to com_articles)
#choose a custom field (jem)
#set a time window
A field for a start date
A field for end date

i.e.: I choose a menu item "category layout".
now with 4 additional fields
that adds an article ID to the link
index.php?option=com_jem&view=categories&addarticle=123

and the view pulls data from the DB by custom field & time window
and precedes with "that" introductory article.

In this way, this selection is retained as an archive.
Otherwise you would have to create several times window category trees - unnecessary & expensive.

How/where can I technically set these fields?

thx, best, j.

I found something here, look at that:
<www.joomlaportal.de/joomla-3-x-erweiteru...befelder-setzen.html>