The Bid Package feature is typically used to break out trades/scopes in order to:

• Create different bid dates for different Bid Packages/trades within the same Project.
  
  
• Write different verbiage on Bid Invites for different scopes and trades (ie., rather than sending a generic invite to all trades, write a specific scope or description per Bid Package/trade for a more personal touch, which helps improve response rates).
  
  
• Restrict project files, plans, specs by Bid Package/trade(s), if desired.
  
  

The Bid Phases feature allows you to:

• Bid a project in phases or stages without having to copy or create a new project for each phase (ie., Budget Bid, 75% Drawings, 100% Drawings, etc).
  
  
• Quickly view prior bid phase bids within the same project.
  
  
• Combine both Bid Package and Bid Phase features in one project (ie., Rebid a project with Bid Packages).
  

Here is a screenshot showing where to access these two features: