Manage start/end structural frame

[Yna_Db]

Hello,
To address the first issue, you will need to place structural connections (I just started looking at this feature):
http://help.autodesk.com/view/RVT/2017/ENU/?guid=GUID-14D5F295-680A-440B-848C-847363BA0D06
There is also a Revit add-in for this:

Steel Connections for Revit

For the second question, Curve.StartPoint gives me the points I expect. Some more details on your workflow could be useful here. See also on this topic:

Get Structural Column Start Point

Hello, I’m trying to get the Start Point of a Structural Column to allow the placement of a Structural Connection. The problem I’m having is in relation to the getting the correct Start Point regardless of Vertical or Slanted. If I use the Element.Geometry–>Solid.Centroid it places the point in the middle of the geometry which is wrong. If I use the StructuralFraming.Location this only works for my slanted columns. If I use Face.Vertices–>Vertex.PointGeometry I don’t get accurate X,Y,Z coor…