Hi Author team. I've got a bit of an issue in that I can't tag the appropriate categories. I've got an adding and subtracting decimals activity. So I wanted to tag it as "adding and subtracting" and "decimals". However I cannot seem to add more than one "Number" topics. I can add other types but both the things I want are in number. At the moment I either have to tag "Mathematics/Number/Adding and subtracting" OR "Mathematics/Number/Decimals" but I want to be able to tag both as they're both equally important. Please help.