With the mixer on low, add in 2 more cups of flour. If you’re not using a mixer you will need to start kneading it by hand.
Continue to add in flour half a cup at a time until you have added in 9 cups total, at this point it should be forming a slightly sticky looking ball on the dough hook.
The dough should be very soft and may a little sticky. I actually always do the last cup of flour by hand to make sure I don’t make my dough too tough. It may require an additional cup of flour. But don’t do much more then that.
Your dough is ready to make into balls.