Whether you are manually logged a revenue in the system or importing a bunch of them at once, you can always associate that transaction with a Campaign.
But what if I forget? What if the Campaign wasn't created yet? What if I chose the wrong Campaign?
Never fear! It's easy-peasy to update or change the Campaign that is associated with your revenue payment.
Navigate to the Contact's profile of the revenue payment that you would like to edit > Click on Fundraising > Click Transactions > Click on the revenue transaction you would like to open
Note: Click anywhere on the revenue row (ie. The Amount) to access the revenue's details.
Click on the purple Edit icon
The same window that you used to create the revenue transaction will appear.
Click on the Associations tab > Select your existing Campaign from the drop-down list > Click Save
And you're done! Great work.