If the school/institution changes which students are in the class or moves a class from period 1 to period 5 and I have already cross-sectioned/combined the two classes (I haven't yet), what happens? Is this bad? I ask because the school will probably be moving students in and out throughout the year and if I have already combined those courses I don't know what will happen.

Also, it was recommended on a forum that I combine two completely empty courses but I was planning on doing one of the courses completely (hours and hours of work) and then combining them when I was somewhat sure the classes wouldn't be altered, say... two weeks in. Can I start completing one of the courses in preparation of combining other empty courses or will this ruin the merge with the other empty courses?

Lastly, If I combine the courses will my students still see their dashboard as Math Period 1, Math Period 7, ect. or will everyone see the same class since I merged them all together?  

Thanks for everyone's help.

Feel free to link a post if these were already answered, however, I didn't see them answered.