Select the Structural reinf. tab on the Reinforcement pattern dialog to define diameter and number of structural reinforcement.

Opening corners reinforcement selects the distribution method for reinforcement of slab openings. The diameter of reinforcing bars and numbers of insets may be selected there.
Two options may be activated which enable definition of the following.
- The length of the inset arm.
- Dimensions of the opening that will be ignored in distribution of the opening reinforcement.
In the lower part of the dialog, you can specify the diameter and spacing of bars in the reinforcement of beam supports in RC slabs.