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Is a truss object available for modeling?

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Answer: Yes, this information is available upon completion of analysis through Display > Show Tables > Analysis Results > Element Output > Objects and Elements > Table: Objects and Elements - Joints. In this table, joints generated through auto-meshing have a tilda (~) prefix. The point-object coordinates are presented, along with the name of the point object from which the joint element was created. If the joint object was not created from a point object, but instead was created as a result of meshing procedures internal to the software, then the corresponding JointObject entry is blank.

Why am I getting different forces at the object start joint and initial station?

Answer: The frame internal forces are computed at the centroid of the member, but the frame joint forces are reported at the joint, which is may be offset from the centroid based on the insertion point used. For example, when the insertion point is specified at cardinal point 8 (top center), the moments will differ by the axial force multiplied by the distance from the centroid to the top of the member. This is expected and correct. The joint forces are intended to represent the effect of the member on the rest of the structure through the joint. The internal forces are meant to represent the behavior in terms of the basic cross-sectional measures.