The copy to extras button is only for use when in Per Square Pricing Mode.
Click this button to open Quick Bid
Or open it from the View menu. Ctrl+Q
Use this quick bid when entering roof measurements is un-wanted.
or
Enter extras or options to include with your bid.
You can add and save items you use often, just click the save button.
You can drag this window to any position and it will be remembered.

To use for your extras in your Job Cost grid click the copy to extras button.
You may not want to add roof measurements for:
Use it for anything you want to have saved record of, that can be recalled with just a couple clicks.
Warning:
Be aware that using quick bid and entering roof calculations you could end up with more than 1 price !
You can use this for any job specific details.