I want to repeat a pattern where the fourth bar of every 6 is in 2/4, but all the other 5 bars are in 4/4.
 
How can I copy the meter changes? 

First Select none then open up the Meters dialogue (Alt + Shift 6) and select the existing meter changes (or insert them if necessary). 

Then Edit | Copy Special and when the dialogue box appears, only select Meter/Key Changes . 

Once that is done, move your NOW to when you want the meters to be copied to. 

Then edit | Paste Special.  The Meter/Key check box should be checked, hit OK and you're done.

Thank you, perfect