I gave to two separate charities and I want them shown separately with separate totals. How do I "total" the donations to a particular charity?

Enter the donations to one charity and finish it then enter the donations to the other charity. If you gave multiple donations to each charity, you can just total them or calculate the average and enter that plus the number of times you donated. 

if it's your desire to show each charity on schedule A, this is not possible in TT except for non cash contribution reported on form 8283