You can close to-dos when you have completed them.
You close to-dos from the To-do List window. Depending on where you access the To-do List window from, the window shows to-dos for either contacts, salespeople, campaigns or teams. The following procedure shows how to close a to-do from a contact card.
Open the 
Contact Card window.
Click Contact, To-dos.
On the To-do List window, select the to-do that you want to close, and click To-do, Card.
On the to-do card, click to insert a check mark in the Closed field.
The program automatically enters the current program date in the Date Closed field.
After you have closed the to-do, the program places a check mark in the Closed field and enters the current system date in the Date Closed field in the To-do List window. Closed to-dos can be deleted.