Hi @rohitsekar1996 ,
I just want to confirm what's data type of portfolio_input column in sharepoint? Is it single line of text type?
If so, what you need to modify is to unify the two column names as the drop-down field only recognizes one column name.
Try to modify the Items property as follows.
If(DataCardValue3.Selected.Value="Country",RenameColumns(REGION_COUNTRY.COUNTRY_DISPLAY,"COUNTRY_DISPLAY","Value"),RenameColumns(REGION_COUNTRY.REGION,"REGION","Value"))
Then set the Update property as follows.
DataCardValue4.Selected.Value
Hope this helps.
Sik