Need slicers group to define AND/OR relatioship betower 2 or more slicers

For example:
I have several flight data, each record have 3 fileds: FROMCITY,TOCITY, FlightDuration.
I use 2 slicers, one is for FROMCITY, and the other is for TOCITY, I need to list all the records that "FROMCITY=Beijing OR TOCITY=Beijing", so I need to set the 2 slicers in an OR relationship....
But now, the default relationship between 2 or more slicers is AND, that means if I set FROMCITY=Beijing ,
TOCITY = Beijing, I can just get the records that "FROMCITY=Beijing AND TOCITY=Beijing".....