Summary/Portal w/out repeating

[mikimonster]

Hello. I have a donation table where each time a client donates I create a new record for each input. I would like to create a List layout where each client's totals are summed up. I do have a sum field set up to grab.

My problem is that when I try creating a list, it lists each time that one person donated. I would like for the table to list the person *once* along with their total donation and not as many times as they have donated. Sorry if this is a repeat topic. I couldn't find an answer. I appreciate any help. Thanks.