Unfortunately, it is not possible register under one affiliate and contribute to a different affiliate.
You will need to select the affiliate you would like to contribute to and this will list you on that affiliate roster for the duration of this competition. When the competition closes, the proceeds will be distributed to affiliates in accordance with their roster of supporters. CrossFit, Inc. will distribute all registration funds to the designated affiliates.
Once this competition is over, and you go to register the Open in the fall you will be able to select the affiliate of your choice.