Open the Project, find the Booking that has already some Objects added as "Extras" via the Timereport, and click on the Object's menu icon where you will find these two options:
1) "Copy" : To copy and paste only one extra select "Copy" from the Extra's, to then paste to another Booking (see how further down).
2) "Copy (Add To Existing x In Buffer)" : To copy multiple extras, select "Copy" on the first Object, and then for successive extras select "Copy (Add To Existing x In Buffer)", to then paste to another Booking (see how further down). The "x" will show the amount of Objects added to the buffer.
The buffer will be emptied as you choose the "Copy" option again - you will then see that, as you click on the following Object's menu, this option will show "Copy (Add To Existing 1 In Buffer)".
Paste by clicking on the menu icon of the Booking where you wish to copy the extras, and selecting "Paste Copied Extras (x)".
The extras will be pasted in the same order that they were copied. Note that you can move them around within the Timereport window by drag&drop.
The "Added By" info from the copied/pasted extras is set to the current user's Username (the User who is copying the extras over).
The "Day" is reset to use the first day of the Booking where the extra was pasted. No matter when the first extra was added, the date will be set to the initial date of the Booking where it is pasted
The "Note", "Quantity" and "Rate" infos are also copied over. You can of course amend them if necessary.