I’m making a cake that has to serve 100 people. Can I make two10”/one 8” and one 6”. ? I just wondered if the two 10” can be put on top of each other separated by a cake board. Would it look weird or funny. I don’t have a 12” pan and would rather not buy one if possible. This will probably be my last cake so hate to invest  to buy another pan. Thanks for your help. I’m not a professional just a home baker.

It sounds like you are wanting to make a double barrel cake for the bottom tier which you can definitely do.  So basically your cake (at least the sizes of the tiers) would look similar to this...

Thanks so much for the quick reply