Help to understand a specific SNOWTAM
Reference: ICAO Annex 15, Appendix 2


  According to the article ''H''; what about the other runway/runways when I want to add extra info other runway/runways too; there is just one runway in here?


A SNOWTAM is for a single runway, if you want to involve multiple runways, you would release more than one SNOWTAM. 


  According to the article ''J'' it is indicated that critical snowbanks; but it is again just 1 runway I think so.


Yes, this is just for the runway identified in C). 


  According to the article ''P'' 15 is the meter of this taxiway snowbank but in which direction is 15 mt.?


This is the distance between snowbanks in meters. There is no direction there as it just identifies a relative distance between two (or more) objects.