OOTB = Out of the Box or the families that come with Revit, installed as part of the deployment. If you're a student using your school's software then you'll have to find out where they have placed this content. Usually it is already mapped to your Revit install so you can just browse to the content.
Look at the existing families, for Revit 2024 they are in the Railings > Balusters folder. There are three baluster templates for families: Baluster.rft, Baluster - Panel.rft and Baluster - Post.rft.
A baluster Post is meant for the start and end of a railing or at divisions between balusters. So your family should be a Baluster Panel since it is being spread across the overall railing. A baluster is meant for individual items while the panel is meant for more complicated assemblies.
I suspect you want the panel to slope so the horizontal parts follow the slope of the stair whether flat or sloped? You'll have to design/constrain those "horizontal" parts to be parallel to the slope reference planes too. The void @Anonymous mentions is used to cut off the excess above and below the railing where the baluster contacts the railings defined in the railing type.
These families are among the more difficult to create in Revit so it will help to analyze how the existing families are built to see what is going on.
Steve Stafford
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