I posted a link on how to make assignment groups above. Unfortunately, there will still be the 10 grades showing up in the gradebook, but there will also be an 11th one that averages those out.
Posting the link on making assignment groups again here: How do I add an assignment group in a course? - Instructure Community - 970.
For example, you can make an assignment group for "Project", which contains 10 assignments: "Project - Week 1", "Project - Week 2", and so on, until "Project - Week 10" (you can name them however you want, though keeping it consistent will help with tidiness).
The gradebook will still have the grades for each week's project, and then will also have a column for the total of the assignment group.
Since you aren't using them yet, I should tell you that assignment groups also have some other conveniences, mainly letting you drop the lowest grade(s), and giving weights to each assignment group.