Hi Krish,
Attach video clip, on my old drawing blocks what i am trying to show here is the limitation of "Dynamic Blocks". To attach the bracing's on multi-lengths of boom will be a challenge to the autocad authoring palletes, "POLAR STRETCH" will be your PARAMETERS then "ARRAY" will be your "ACTION" of the selected parameters. The action of your array will be to copy multiple bracing's @ equal distance from point origin ex. if the total length of bracing's is at (x)500mm and your Main Boom is @ (x)4550, then your set's of array will be at 4500 in total length with a total bracing set's of 9 pieces. On the attach screen grab, notice how the bracing's misaligned from the main boom. So i came up on a solution to use a "LOOK-UP PROPERTIES TABLE" to mitigate the challenge "CHAIN ACTION" was not helping.
Programming your crane drawing will be perfect, drawing & calculation will be of the same time "for start you may use" "AUTOCAD & EXCEL".