Chord Gbsus2 You must leave out the 6th and 5th strings. Gbsus2 - Gb suspended 2nd guitar chord is often noted with non-standard names like Gb5add2, Gb2(no3) or Gb2. Sometimes it"s referred to as Gbadd9(no3).
Note: Gb, Ab, Db, Ab
Step: 1-2-51(F#/Gb), 2(G#/Ab), 5(C#/Db)