Just been reading various requests or questions about adding sets of coins to the catalogue. Has a final answer on how, when, where, why, etc. been posted. I have various Royal Mint sets of UK Uncirculated coins, as well as sealed year sets from other countries (e.g. Canada, Holland, etc.), but there appears to be no way of adding these as a group.
In my humble opinion, this really should be an option at the bottom of each list of years under each coin, but I accept that that would be an enormous task for some poor soul (apologies, I don't have the IT skills for that one, especially as I'm still struggling with cropping photos of any new coins or exonumia I submit).