I had created an analytic account for a project. The project is completed. I need to close that particular analytic account to prevent further posting to that particular account.

1. I need to prevent showing the particular analytic account/ project in the purchase module and purchase order lines so that the there shall not be any purchase on the closed account.
2. I need to prevent showing the particular analytic account/ project in time sheet.
3. I need to prevent any further posting of invoice/cost etc in that particular analytic account/ project.

Plz help.