here getDAtes and isChecked are boolean values and we fetch startDate from grid and caluclate starttime according to it. there are time values in allTimes array

//index.js

{field: 'starttime', headername: 'starttime', renderCell: (params) => (
  <Dropdown value={(getDates && isChecked) ? getStartTime(params.row.startDate) : 
   getDropDownStartTime(params)}
     options={[...allTimes]}
     onChange={(event) => {
       params.row[STARTTIME] = event.target.value;
       handleGridUpdate(params.row, STARTTIME);
     }}
  />
}

//handlegridupdate

handleGridUpdate = useCallback((row,type) => {
  const item = info[row.id] ? Object.assign({}, info[row.id]) : {};
  if(type === STARTTIME){
    item.starttime = row.starttime;
  }
info[row.id]=item;
dispatch(setInfo(info));
}, [dispatch, info]);