The numbers can be defined with parameters #6050 to #6059.
They are assigned to program numbers 09010-09019
For example, if you enter 81 in the parameter #6050, then the program 09010 can be cylled with G81
O9010 = #6050
O9011 = #6051
O9012 = #6052
O9013 = #6053
O9014 = #6054
O9015 = #6055
O9016 = #6056
O9017 = #6057
O9018 = #6058
O9019 = #6059
But it’s always variably which G commands are frei. You should research that yourself
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