Learn the basics about creating a parametric family, with a culvert.
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Learn everything about creating a parametric Revit family:
https://engineerbear.com/revitfamily/
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Timecodes
0:00 intro
1:50 Family template
3:10 introducing workflow
5:20 phase 1 Reference plane
6:00 phase 2 Annotation
6:00 phase 3 Parameters
10:50 phase 4 Geometry
12:30 Material
13:00 Flexing