description.ext:

class CfgCommunicationMenu
{
	class PMC_Airstrike_A10
	{
		text = "Airstrike A10";
		submenu = "";
		expression = "_this execVM 'PMC\PMC_Airstrike.sqf';";
		icon = "";
		cursor = "";
		enable = "1";
		removeAfterExpressionCall = 0;
	};
};

init.sqf:

// add communications menu for player
0 = [player, "PMC_Airstrike_A10", nil, nil, ""] call BIS_fnc_addCommMenuItem;

PMC_Airstrike.sqf:

// _p will be our cursor position on ground or mapview
_p = _this select 1;