Field with auto value (clone another fields)

Hello,
I need to create the field like that:
There is field1 - value XX, field2 - value YY.
And I need to create field3 where will be auto (default) value and which will contains the values from the field1 and field2 (e.g. "XX € / YY €") "{field1:value} € / {field2:value} €"

Could you please help me how can I do that?

Thanks a lot,
Jan

Hello

1. if you need this only for displaying then you can just create a custom layout and select it inside the "Viewing TAB"

2. if you need the value of this field to be stored in the Database
- thus it will be also possible to use it as FILTER in your views

then you can do this via a text-field and the custom value parameter
but you will need to install FLEXIcontent "Pro" task plugin