@Anonymous wrote:
i have tried that way but here it said...
@Anonymous
It will not work if you jump between one reply from 1 forum member to another reply from another forum member (with all due respect to all of them). That is what generates CHAOS regardless if all the methods being suggested are right. So I would suggest that you UN-MARK all the solutions you have marked so far, Focus on one person, TAG that person when you reply using the @ ...solve the issue you are having and Accept that which has solved your issue as a solution!
Question 1 -
What should you do with the connections...There are a bunch of useful tools you can use under Steel Tab - Mitter/Cope/Cut through/Cut By. Additionally you can use Connections...

Additionally, you need to know the Structural Element (in this case Beams) join behavior depends on the Material Behavior defined in the beam Family - Wood/Concrete/Steel...
Question 2 -
The error - A truss family is a family which defines a system consisting of Top Chord, Bottom Chord and Web Elements, before you place the truss, you need to define those elements in order for Revit to replace the detail lines you have placed in the family with actual ELEMENTS ie: Beams Hence:
- You load a Truss
- You define the beams to be used for the Chords and the Web
- Place the Truss as shown above
If you do not define the Turss's elements before you place it, there are high chances that Revit will not be able to place it if the Shape is eccentric