Column modeling for reinforcement?

[saaahin]

Hello, I am doing a risk analysis of an existing structure. During the construction, only the ground floor was strengthened and another column was built under the cantilever beams for reinforcement purposes. The later column is adjacent to the overhanging column. As in the attached picture... I can't define two columns to a single node in idecad... how else can I model this situation?.. thanks.. take it easy...