Transforming Dyadic Dataset into Monadic

Hello,

I am having a hardtime thinking about ways to merge a dataset that is dyadic, into monadic. The dataset is on foreign aid and the authors have designed in the following manner:

year -- donor country -- recipient country -- type of aid (economic development) -- type of aid (social development)

1999 -- US -- India -- 6000 - 6000
1999 -- UK -- India -- 700 -- 9000

i want to merge the types of aid that countries receive (or by recipient country). How do I do that? In other words, I want to see total aid for each category that those countries received.

Thanks,
BA