In the past we had to copy rebar from one column to another within Revit and sometimes it was advantageous to place them in groups, and with the newer versions of Revit, copying rebar became a lot easier. We have a tool that is called propagate rebar.

Consider the situation above where there is a square rectangular column, and some rebar has been placed inside the column. The other columns are very similar shape in this instance some variations of a rectangular prism. Also note that we have included a circular prismatic column. How does the rebar propagate?
First select the rebar. Easiest is to select the column and rebar and then filter out only the rebar. Once only rebar is selected, the contextual ribbon shows the Propagate Rebar tool. Once the command is active, Revit expects a host or the face of a host to position itself.

It is interesting that the top of the round column can also act as a host face, in which case the rebar is copied into the round column. Otherwise, the host can be used. If the geometry is like the original, the rebar arrangement adjusts to fir the news host cover. This can be seen in the three rectangular prisms, while the circular prism shows how the original rebar arrangement is unchanged in size.

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