I don't have access to whatever reference you are citing (and you didn't include any images)
- but I assume you are referring to Splitting faces rather than surfaces (these have specific meaning in MCAD).
You can either Split faces before going into Analysis or in the Fixture or Load command itself.
In this image I am Splitting the clamping face for a fastener....
Hi Salvador there are a couple of ways to do this.
From memory the exercise asks you to have a 5mm wide face ont he container handle you could do this using a pair of planes on either side of the container handle.
In the picture above, I've created a plane where I needed it, then go to Insert, Curve, Split Line, and use the Intersection option. You could then create another plane offset from the plane and repeat.
Hope this helps