If takeoff exists on this Page in any Bid within the Project, that takeoff is lost if you delete this Page. You are warned about this when attempting to delete a Page. The Plan Organizer, although opened from a Bid row on the Projects and Bids List, is a set of Shared Plans for all Bids within that Project. Although each Plan Set can be activated/deactivated for each Bid, the Plan Sets and the Pages they create are shared between all Bids - deleting a Page "for one Bid" deletes it for all Bids - be sure you know what other users have done in the Project before deleting a Page or causing a Page to be deleted (see Related Articles for more information).
Deleting a Page cannot be 'undone' so be careful when deleting any Page from your Project.