Ion-radio sub-list should checked with previous selection

i have a list contains two items each item contains list of radio items. if i am selected one radio-item and go to the second item and selected one more radio item now going back to my first item sub-list it should checked with previous selection.


left side list contains vendor list item. for every list item there is a sub-list. for suppose if i have selected one radio-item(sub-list) of particular item(vendor) and selected one more radio-item from another item(Vendor Batch). Now my problem is when i am going back to the my previous list item(Vendor) previous selection is not showing.

Could you please help me. Thanks in advance.