How do I convert this C code into a Simulink model?

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I am trying to convert some C code into a Simulink block diagram without using S-Functions (since they incorporate C code). The C code that I am trying to convert has the following format:

if true
  myVar += myConst1 - myConst2*myConst3
  \\ More code changing other variables etc.
  myVar -= myConst4
end

How would I model lines 1 and 3 in the code provided above?

I was thinking that I could save the signal myVar from Simulink dynamically so that I can use it in another part of my Simulink model, but I need it to save the signal as the model is running (not just when the simulation is done). Is there any way to accomplish what I need?

Thank you in advance!