You will need a component called cxEditRepository, add LookupComboBox to Repository on your cxDBColumn use the event OnGetProperties
In this example, my column is called 'text'
procedure TForm2.cxGrid1DBTableView1TextGetProperties(
Sender: TcxCustomGridTableItem; ARecord: TcxCustomGridRecord;
var AProperties: TcxCustomEditProperties);
begin
if ARecord.Values[cxGrid1DBTableView1Text.Index] = 'value2' then
AProperties:= cxEditRepository1LookupComboBoxItem1.Properties;
end;
I hope this has helped