How to create a variables in simulink of a pre-set variables within a Simulink.SimulationInput

I am using a for loop to conduct parallel simulations via parsim

for i=1:iterations

%LOAD SYSTEM

in(i)=Simulink.SimulationInput('MDL');

in(i) = in(i).setVariable('X',1000,'Workspace','MDL');

I want to create an additional variable in the following way:

in(i) = in(i).setVariable('Y',X*10,'Workspace','MDL');

I hope you could help me