Basic Question: Printing multiple materials using dual extruders

[drzymala 0]

Dear Community:

I have a basic question that I hope can be answered. I would like to print two materials simultaneously, one embedded within the other on an Airwolf3D HD2x having 2 extruders. I have created two separate .stl files, one for each object, while preserving the coordinate system. I have loaded the files into Cura separately, then merged them. Each object appears to be in the correct location. How do I assign the desired extruder number and material to each object? Thank you for your help. I am having difficulty finding this procedure on the web.