This may be self explanatory but I just want to make sure.

I believe most Wilton Yearbooks or wedding books have a sections that explains this. I believe you trim them to the hieght you need and then place them in your cake. You will want to use a separator plate to mark where the placement will be. You then plave the tier into the holes. When using these...you should not have to use any dowel rods.

I hope that all made sense!