There are three power net: vcc_gc, vcc_m1, vss.
vcc_gc is the local power supply, vcc_m1 is the global power supply, vss is the ground.
There are two voltage area, one is always on and the other is power-switched.
For the always on area, it doesn't require power switch cell. Cut vcc_gc from the switched region and connect vcc_gc with vcc_m1.
For the switched region, add power switch cell below the power straps of vcc_gc and vcc_m1.
You need gap between macros if you have the switched power supply to macro, otherwise, your limitation is the drc rules.
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