I'm doing a basic, nonreligious, nonspecific Happy Holidays card (yes, too late for this year) but can only find the Happy Holidays category under Holidays/Christmas/Happy Holidays. That seems odd, since customers avoiding the Christmas thing might not think to look under Holidays/Christmas. Plus, I don't know what the second category would be. Ideally it would be in Happy Holidays/General and Happy Holidays/Humor or animals. But I can't find anything like this, what should I put it under? Thanks.

Agreed it gets confusing and there are many ways you could approach it.
 
We have found that since Happy Holidays and Season's Greetings are not a holiday of their own that they still fall under the Christmas umbrella.  Many people that celebrate Christmas do so in a non-religious way, yet many still call and consider it Christmas or as offered ... Season's Greetings or Happy Holidays.
 
There are many ways to approach this and none of them are really wrong ... GCU put great thought to this, shoppers' expectations and behaviors and have kept Season's Greetings and Happy Holidays under Christmas.
 
We've yet to have a shopper ask or share that they could not find the Happy Holiday or Season's Greetings cards and they have strong sales which are both good signs that we're on the right track