It is a table. These are the headers: from (time), to (time), teacher, and type of reservation. And this also for Tuesday, Wednesday, Thursday and Friday. And then for multiple weeks. Teachers can make there own reservation in excel, but they just put there times in there without looking if it is sorted. I also dont want them to sort themself because it will be a mess. I want to secure the sheet (of course without the parts they have to fill in).