Select Quote::View Quotes menu * Assumes your default view is the Standard View - instructions differ if using a custom default view.
Click Options... button
Click Add Filter... button
Select the Filter Type (CG) Quote Field
Select Expiration Date
In date = any, after = 0 day(s) from today
Click OK
To save the newly created View, click Save View... button, enter a name and specify if the View should be available to everyone (Shared) or just you (My View).