How to add loads from different loadsteps?

Hi,
I'm running (Radioss NLSTAT)
a simple beam model with
two loads applied on the same node.

calculated in two loadsteps:
Fx in loadstep 1
Fy in loadstep 2

# Both loadsteps are independent,
thus results are independent.

# Now loadstep 2 is defined as CNTNLSUB
BUT the loads Fx and Fy will not be added
(like using OP=MOD in Abaqus, loads are on same node)

Question:
How can I get in loadstep2 the result of
(loadstep1+loadstep2) Fx + Fy?

Is there a way to define loadstep2?(without adding forces in a load- card)

Thanks, Dirk