For simply computing homogenized material data, a single Material Designer component system is enough:
Add a Material Designer component system in Workbench,
Define the constituent materials through Engineering Data.
Start Material Designer by double-clicking the Material Designer cell.
Setup and run the analyses as outlined in Material Designer Features.
If you want to examine the computed data in the Engineering Application, connect the Material Designer component system to an Engineering Data component system.
In this way, you can also export the computed materials for use in other projects.