Welcome Anne,
When you place an element, even if all your stories are 0 height between them, elements will only show on the story they are set to. You do have the option to set which story or stories you want the element to show on.
I'm not sure what kind of an element you are placing.
In the floor plan display you can set which stories it will show on.
Please add to your signature the AC version you are using and your OS.
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"