Create a view field that contain the sum of specific fields for a specific user
Try View Aggregation setting:



Goto Advanced tab, scroll down below and set "Use aggregation" to
'Yes'.
Filter Your View with Name field (user reference).
Now there must be "Aggregation settings" inline with your field
"the amount of the donation"
Goto "Aggregation settings" for "the amount of the donation"
field and select 'Aggregation type' to 'Sum'.



  Thats it, you are good to go now.