This short cut key helps the User to toggle and Isolate between Geometry individually.
All you need to do is go to Maya – Window – Hotkey Editor – Under Categories – Select ”User”
And click on ”NEW” and paste this script under the ”Command” Box.

string $icam = `getPanel -withFocus`;
int $isolateStat = `isolateSelect -q -s $icam`;

if($isolateStat == 0)
{
enableIsolateSelect $icam 1;
isolateSelect -state 1 $icam;
}
else if($isolateStat == 1)
{
enableIsolateSelect $icam 0;
isolateSelect -state 0 $icam;
}

Next click on ”Accept” and just a Key to it under ”Assign New Hotkey”

Personally I set it to ”i” according to Zin.

This Isolate Toggle script credit belongs to Zin =)

 

*Ignore the text color*