The Items Screen - with Activities
(click on the screen to see more Items views - read about it below)

This is where you work on your Bid Items. 

You can show up to three levels of Items and can show all of their Activities and Details.  as you arrow up and down through the Items list, the bottom section instantly shows you the dollar details for that Item (and for the overall Bid).  You can simultaneously arrow left or right and adjust the Actual amounts if desired.

You can add all your Items then go back to work on their Activities and Details, or you can complete each Item before doing the next Item.  To work on an Item's Details you just double-click on it or use the arrows and Enter key to open it's Details Screen.