lifting the construction
I would not add the support OVER the CG, rather add a support(s) to the BEAM itself at the point(s) where the cable will attach. Looking at the reactions at each support will tell you if the structure will be stable when it's lifted.
Adding a single support for a structure with no rotational restraint can't ever be modelled..
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That´s not true.Forces on the inclined cables will produce horizontal forces on your structure. I would set the supports on the exact direction of the cables.Doing that you won´t need to add any other supports. For creating the " tricky" support ,create a new one fixing de X direction , then click on " direction" and give the coordinates of the point where the 4 cables will join.Then assign this support to your 4 lifting points.Check if they´re on the exact same direction of your cables.
Rafael Medeiros
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No ,just Ux ,as long as you set the support local direction like I recommended
Rafael Medeiros
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Yes ,but it looks like the support directions are wrong, probabbly due to the fact you assigned a fixed support for them all
Rafael Medeiros
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Forces on the inclined cables will produce horizontal forces on your structure.
Perhaps this is true, but your method seems like a lot of hard work for not much gain. But each to their own 
