Copy Daily Packages works the same way as 'Copy Daily Rates' See Copy Daily Rates . It is used to copy one package type to another by increasing or decreasing the base rates. Restrictions can also be copied from one package type to another for the same date span.
To access Copy Daily Packages;
The following screen opens;
Package to copy from - Select the package to copy from
Start Date/End Date - Enter the start and end dates to copy from.
Packages(s) - Select the package(s) to copy to. Use <CTRL> key to select multiple.
To update specific restrictions, select the restriction to the right by checking the box. 
Select the green checkmark to run the copy update.
Function - all packages from the 'package to copy from' will be copied to the 'Package(s) to copy to' for the selected dates and selected restrictions.