To start the slab design

Tip: When you import STAAD.Pro model data into RCDC, grids are automatically detected and assigned. You can manually edit both the exact locations of grids as well as grid labels in RCDC for drawing generation.

In the top-right dialog, select Level :1 from the drop-down list and then click Design Slab.

RCDC opens and the New Project dialog opens.
Enter the project data:
1. Type Tutorial in the Project field.
2. (Optional) Type Client and Engineer name. This information is used as the header for all reports. It will be automatically imported from the STAAD.Pro input file Job Information block if available.
3. Select EN 02 - 2004 from the Design Code drop-down list. This tutorial uses the Eurocode. However, you can select any available code. Just note that some design settings and features may vary based on the code selection made here.
The slab edges are automatically detected and continuity is established.
Either:

select the Design Parameters tool

or
select Settings > Design Parameters

The Design Settings dialog opens.
In the Available Rebar list, clear the check mark by 25 (mm). This tutorial will limit the rebar size.
Note: All other design settings are left as their defaults, but you can make many design and detailing changes here.
Click OK.
Either:

select the Crack Width Setting tool

or
select Settings > Crack Width Settings

The Crack Width Settings dialog opens.
Select the Perform Check option in the Crack Width group.
Note: Leave the Permissible Crack Width as the default value and leave the Perform Check option in the Initial Thermal Cracking group unchecked for this tutorial.
Click OK.