Simulink - global bool variable

I manually turn off and turn on something(2 constant blocks and 1 switch), but my problem is when I am inside some subsystem(subblock), because I need to check whether it was "on(1)" or "off(0)".

So is there any way to store a value in this case 1 when it's "on" and 0 when it's "off", and to be able in my subblocks to check that variable.

Kinda something like global variable in some programming languages

[Kaustubha Govind]

Why not just use a boolean signal, where that notion is inherent, true indicates 'on' and false indicates 'off'?