Think about what goes on in the solution - you're solving [K]{x}={f} for {x}. So for a given load case (W+T1+P1+U1), each of these components adds or inserts values into {f}, the load vector. Only after the construction of [K] and {f} is complete, does the solution for {x} begin. From this point forward, the solution doesn't know (or care) which values in {f} are from "W" or "T1" or "U1".

So in CAESAR II, what you do for a load case, you do for the whole load case. That is why I pulled "U1" out into its own load case.

If you're running another software package where the operation isn't clear, ask them how its done.