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This tutorial was initially developed for bridge modeler in SAP2000, but the concept also applies to CSiBridge.
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h1. Modeling Steps

Create new bridge model with "Conc. Tee Beam" bridge deck section via "File > New Model" using the Quick Bridge template.

Note that the default interior bent is modeled by a single column:

!fig 1.png|hspace=30px!

Select the frame element representing the bent cap and all joints located on this element:

!fig 2.png|hspace=30px!

Use "Edit > Edit Lines > Edit Frames" menu command to break the frame element at intersection with selected joints.

Reselect the 6 frame elements created by dividing the original bent cap and use "Edit > Extrude > Extrude Lines to Areas" menu command to extrude the bent cap into the wall. Enter -31 for increment dz, 10 for number and check the "Delete Source Objects" option. This will create a wall of approximately the same height as was the height of the original column:

!fig 3.png|hspace=30px!

Select the bottom joints of the wall and assign constraints to the via "Assign > Joint > Restraints". The completed model is shown below:

!fig 4.png|hspace=30px!

You can also change the section properties for the areas assigned to the wall to model the actual wall properties. If the bent cap is integral with the superstructure, you can create the wall support below the bent cap and connect the two components by links representing the characteristics along this interface (such as shear only connection).