Hi,
in the "description.lua" use "empty" (transparent) for numbers you don't want. Important is also the "true" at the end.
e.g.
{"mi_8_BALKA_2_1_NUMBER_100", DECAL ,"empty",true};
For numbers you want to have, use instead "empty" the name of your numbers-file. And "false" at the end. The numbers-file must be in your skin-folder.
e.g.
{"mi_8_BALKA_1_1_NUMBER_001", DECAL ,"Number_GR",false};