SSRS 2008 - How to add a subtotal to a matrix

How do I add a subtotal to a matrix in reporting services 2008? If I right click on a cell I see an opti开发者_Python百科on to add a total but no subtotal.

(I feel like I'm missing something obvious but I've looked everywhere.)

---

Ok I think I figured it out. You have to right-click the group and select add total.

I was confused because the total was for the group I clicked instead of totaling that group's children.

I was also getting all 0's for the totals, but it turns out that's what my data summed up to.