The answer, my writerly friend, is big, fun changes!
Before, if you wanted to set a new word-count challenge for a novel, you had to start a brand new novel too. That meant that some of you had to start a lot of new novels and name them things like "My Novel Part 1," "My Novel Part 2," and so on, just to keep setting new word-count goals for a single project.
Well, now things are different. Now, you can set as many word-count challenges as you want for a single project.
For example, you can decide to accept the April Camp NaNoWriMo challenge with a novel you've already started. That way, you can keep working on it! Just click the "Continue working on a novel I've already started" button when the challenge invite appears on your Dashboard.
You can do the same thing with Personal Challenges. Like, for example, if you if you don't want to do Camp, but you want to keep working on a novel you already started, now you can go ahead and set a new word-count challenge for it yourself. To do this, open the novel and click the "Set a new personal challenge!" button that appears in the Challenge box.
You can keep doing this as long as you want! The only rule is that you can only have ONE active or upcoming challenge per novel. For example, you can't set one hundred word-count challenges for a single project - you have to finish (or leave) your current or upcoming one before you can set a new one. (To leave a challenge, open up the novel in the writing space, then click the wrench next to the challenge's name.)
We hope we designed this new feature well enough that it won't be too confusing to use, but if it is (or if something goes wrong), don't panic! You can email firstname.lastname@example.org, ask in the Tech Help forums, or send a message to Marya_Brennan using the Message a Moderator tool from your Dashboard.