@nadir ,
Adding extra properties to a custom dimension is not a one-step activity, considering it is extra to the custom.
First, you have to add these settings to the advanced import options as described in the documentation section in my previous post and perform double data import - once with the custom field deselected to remove the existing field and for the second time - reselected to be recreated as a dimension in a separate table.
Then you may import additional properties for members of that dimension from an external data source.
You may read the basics of importing data from external sources here - External data sources.
You may read more about the additional data import in this community post - How to build profit & loss report with additional data import.
Please look closely at the section Rates import for a user - that most closely refers to your use case.
Regards,
Oskars / eazyBI Support