phase assignment chnge

I have side street phase 4 and 8, permissive only. I want to change it to phase 4 and 7 and 3 and 8 for protected operation. I go to intersection, timing, click on phase, and change phase number. What happens next is both thru and left turn in the same direction assume the same phase number. I can not figure out how to assign them independently short of deleting the intersection and re-entering all the data back in. I have version 6.0.0.15
Any suggestions?
Jan
Any suggestions?
Jan