Change column data based on data from another column in QTableView?

[adutzu89]

Can you be more specific about it?
If I put

if (index.column() == 8 && value==99){
                       if(index.column()==9){
                             return value.toString().replace("99","0");
                      }        
        }

if (index.column() == 8 && value==99){
                       if(index.column()==9){
                             return value.toString().replace("99","0");
                      }        
        }

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,for example, nothing happens and I ran of ideeas how to target column 9 from inside column 8 block.
I understand how to target them normally by checking if index.column matches the column I want, but I can't figure it out how connect those 2 columns.