Gerry,
Although I haven't done it yet, you are supposed to be able to create a post, select the elements, and save it as a railing post subtype library part. Then, in your railing tool, open the baluster settings, and then pick that post as your baluster from the available post library parts. Should be as easy as that.
Richard
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Richard Morrison, Architect-Interior Designer
AC26 (since AC6.0), Win10