We can store values in Simulink. But, Not at runtime. Once a simulation is done we can store the values of that simulation in workspace and use them for next simulation.
Refer to this link for better understanding:
But in your case, you can do like this:
Use compare to constant and switch block to store the value of sine, at point where value of ramp is equal to specific value, in your case 1. Then you can use compare and trigger the switch. You can refer to attachment I attach for better understanding.
