I would like to erase characters "(B)" in the code column, so then I could do "summarise" the 'stock\_needed'. My data looks like this.

```
  code   stock_need 
(B)1234    200          
(B)5678    240      
1234       700          
5678       200          
0123       200          

```

to be like this.

```
code   stock_need 
1234       200          
5678       240      
1234       700          
5678       200          
0123       200  

```

How could these "(B)" erased? Thanx in advance