Record the events in a horizontal statements model below. In the Cash Flows column, use the letters OA to designate operating activity, IA for inves change in cash. If the account is not affected by the event, leave the cell blank. The first event is recorded as an example. (Not every cell will requir cash outflows with a minus sign.) Record the events in a horizontal statements model below. In the Cash Flows column, use the letters OA to designate operating activity, IA for inves change in cash. If the account is not affected by the event, leave the cell blank. The first event is recorded as an example. (Not every cell will requir cash outflows with a minus sign.)