[Koha] Doubts cataloguing serial items

[Rubén Fernández Asensio]

Hello all,

Could you share some experiences with a newbie and amateur librarian 
like me?
I've started cataloguing old serials for my library. Many of them are 
very old or have had a long life, so there are many variations of 
periodicity, size, publisher, title...
I've created biblio records and now I'm creating items for each 
volume/number/issue in our collection, and I was wondering whether it's 
possible to add subfields to 956 to note each volume's size and page 
number. What would be the best approach? Does any of you do this? What 
do you recommend? What are your practices when cataloguing old serial 
items? What kind of information you put, and in which subfields?

So far my MARC framework is taking advantage of 952$h mapped to 
items.enumchron, and I wonder whether it's possible to create an adhoc 
subfield and map it to biblioitems.pages, but won't that conflict with 
300$a? Same about mapping another 952 subfield to biblioitems.size, 
which is used by 300$c. Or else should I just make 952$z repeatable?

Maybe my questions are silly, but I know nothing about databases and 
don't understand the inner workings of Koha. The official documentation 
is not very clear on the function of SQL tables like items.materials, 
items.copynumber, biblio.serial, biblioitems.volumedate...

Rubeno Fernandez