design/copying a bunch of records

Hi all,

I hope to be able to answer more questions than I need to ask later
on, but for now.. :-}

I'm trying to make a system where the admin will create a set of
categories and products, sort order and all, where multiple users
will be able to make custom sets with the same records, with optional
translations, different prices, different product- and category
sortorder. If the admin removes a product, the users won't be able
to use that anymore either (inner join, or a loop-delete from user
sets), but they can add their own products as well. If the admin
adds a record, it would be copied to all user sets as well. This
probably screams "duplicate data" but nearly all records will need
translations or price changes, and custom sorting, so I couldn't
figure any other good way.
So I figured the best way was to copy the records from the
admin-set to user-sets (but suggestions for other ways are very
welcome!), and was wondering if there is a 'good' way to copy about
50 records to different tables every time you add a user account -
the only way I can think of is write some loops in PHP. Better ways?
TIA!

Regards,

Martin
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