You can Markup abstracts as accepted or rejected in bulk without having to mark each one using the Codes function.  First click on the Markup function on the Abstracts screen and select the status that you want to apply in the drop-down box.

Once you have selected the status you can input the serial numbers of the abstracts to which you want that status to apply.
TIP: You can organise the abstracts using the All Abstract Data (Excel) report and then copy and paste the blocks of serial numbers into the Markup function.