Information about how to schedule with events is available in the BI Launchpad User Guide in the End User Guides - Application Help section here: SAP BusinessObjects Business Intelligence platform 4.1 – SAP Help Portal Page
You create the schedule events in the Events section of the CMC - it's pretty straight-forward to do:
1. Under Events, select the "System Events" folder.
2. Create a new Event.
3. Set the Type to "Schedule", give it a name and set Result to "Success or Failure".
4. Click on OK.
Let's assume you have two events that are named "Pub1 Finished" and "Pub2 Finished" and three publications named "Pub1", "Pub2", and "Pub3".
When scheduling Pub1, click on Events. At the bottom of the page, move "Pub1 Finished" to "Events to trigger on completion:". Set the rest of the schedule as you normally would.
When scheduling Pub2, click on Events. At the top of the page, set "Events to wait for:" to "Pub1 Finished"; at the bottom set "Events to trigger on completion:" to "Pub2 Finished". Set the rest of the schedule as you normally would.
When scheduling Pub3, click on Events. At the top of the page, set 'Events to wait for:" to "Pub2 Finished". Set the rest of the schedule as you normally would.
This will chain the schedules so that only one will run at a time and, when it finishes, it will kick off the next one automatically. Even if you schedule all three reports to run at the same time, they will wait for the appropriate events before the schedule actually starts processing.
Also, as Jawahar mentions above, the RAM on your system doesn't have anywhere near enough RAM for processing the types of publication schedules that you're planning on running.
-Dell