@SanthoshRanga

Create a page list Countries on the case, and inside each Country add a nested page list States. Build a CountryList table view bound to .Countries, make it read only, and show columns Name, Code, and Capital. In table settings turn on row details and point it to a CountryDetails view so each row gets an expand arrow. In CountryDetails drop a table bound to .States, keep it editable, and add row actions Add item and Remove item. For Language, use a Picklist that allows multiple selections and source it from a data page like D_Languages or a predefined list, storing the values in a list property on the State. For delete, either enable Confirm before action on the Remove item row action or open a small modal view that asks for confirmation, then on confirm run Remove item. Since Countries are entered on the previous screen, do not allow edits in CountryList and only allow changes in the States grid. Optionally hide the expand icon when a country has no states and cap rows per page to keep nested grids fast. This matches your screenshot pattern without relying on colors or custom HTML.