First, compute the direction cosine of the line of action of the restraint. Then input the numbers exactly as you have outlined above. For example, say we have a pipe element that runs in the +X, +Z direction at 30 degrees from the +X toward the +Z (draw this on a piece of paper for clarity). Then an axial support would be defined as X(.866, 0, .50). A lateral support would be defined as X(-.50, 0, .866).

But remember that a Guide is always a lateral support so you don't need to enter direction cosines. Likewise, a LIM is always an axial support.