During this sequence, new Sticky Notes can be found and more computers can be hacked. You can do these at your own pace.
Go the elevator and pick the 15th floor. Head to the CCO's office. After the cutscene, ride the elevator back to the 2nd floor, then enter the office on the right using a Level 1 clearance. Head inside, go to the computer, then start hacking. On the first hacking sequence, you have to guide the data bit until it reaches the green line in the sphere. For hacking solutions, you can refer to this page.
Head to the elevator and go to the lobby. Talk to the courier by the coffee stall, then return to your workstation at the 2nd floor log back in to the Animus when you're ready.