To remove column  you should go to the Settings > Account settings, then ( at the left menu > print settings) and find field "Customize print with CSS" and paste code: Example for remove the product code column: }

@media all{ 
  table.main_inv_table tr .code_col {
    display:none;
  }
} Below are codes of rest of the columns: nr_col text_left quantity_col price_net_col tax_col tax_value_col total_price_net_col ... so ... to  remove column just replace COLUMN-CODE with the right code. }

@media all{ 
  table.main_inv_table tr .COLUMN-CODE {
    display:none;
  }
} Below are examples of column codes