Select the periods in the grid by mouse, Right click for a pop-up Menu of your miscellaneous periods, and choose the one for the options. You may also 'block select' by dragging your mouse across the row or column before right clicking.
Once you are done, select 'Copy - Master Timetable to All' from the menu. This copies the Main timetable layout to all the others.
You can select the other master timetables from the tabs. Here you may add extra miscellaneous periods to the other timetables. If you do, don't forget to copy that master timetable to the individuals concerned.
You also have the ability to allocate miscellaneous periods to classes, educators, rooms, subjects and groups on an individual level, for example, if an educator can only give classes in the morning until 10 am, you can create a miscellaneous period called 'reserved' and allocate this to the periods after 10 am for that educator.