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Create a column by stacking components, blocking them together and adding them to the library. Or you can convert them into a symbol.
Posts Beams and Columns
407 - Drawing Columns Using Molding Polylines and 3D Solids
408 - Creating Stacked Columns and Converting Them into Symbols
330 - Drawing Columns Using Posts, Railings, Polyline Solids and Library Objects
5314 - Working with Post Tools, Framing Labels and Edit Tools
328 - Framing a Floor with the Beam and Post Tools
405 - Drawing Decorative Beam or Truss Symbols