Follow these steps to create layout of Structural Framing elements based on the boundary of the reference Floor.
1. Load Families.
2. Create configurations or modify sample configurations.
3. Create Floor or use existing Floor.
Note: Direction of slabs depends on span direction of Floor.
4. Link configuration to the Floor Layer.
Select configuration and Layer where these slabs should be created. Top of slabs will be created at top of that layer.
5. Select Floor and choose command Add Flooring.
Here is result of simple layout of Structural Framing. For further development of slab layout read other documentation.