Fast offerings in a separate Branch than our home Ward

I serve in the Lakeview 9th Branch as the 1st Councilor(or First President), but I am still a member of the Lakeview 7th Ward. We have just started making our donations online, and can't figure out how to pay our Fast Offering donation to the 9th Branch as we have been doing for some time by hard copy. As you check our last years donations you'll see that our Fast Offering donations were made to the 9th Branch. I need to make two donations of $[amount redacted] to the 9th Branch . Help
[name redacted]

Moderator edit: Redacted amount and name.

Regarding which unit would process online fast offering donations, it might be beneficial to discuss it with your stake president. The others in the moderator/administrator discussion mentioned that fast offering funds are swept directly to and reimbursed directly from Church headquarters. There was also mention that there are some handbook instructions that donations should go through the unit that holds the membership records.