There are 2 ways this information can be exported to Excel:
Using View to Excel:
From Estimating, deactivate any unnecessary Columns
Select View in Excel Icon from top right of the View window
Exports all items with Collection pages and a Bill/General Summary information
The Print Bill Report:
Select Reports, Estimating, Print Bill
Press OK, select Text File from Output to section, press OK
Save the Text file
Open Excel
Click File, Open, All File Types, the text file
Follow the Excel Import Wizard steps to open this in Excel.