Concatenete values

[Faridininho]

Hi,

I would like to know how can I create a new field which will concatenete x values (area code) into one string value.

Example:
 

In example above, I would like to have a new field named “Parking Group” where we I can have a value named “Visitors” and which will include area code 750.009+750.016+750.015

Thanks for your help.