Hi Sainath,

You can achieve this requirement with steps below steps,

1) Create an Activity and pass the complete timing list(Say A) to it.

2)Do an ObJ-browse to get the list of already booked slots(Say B) from DB(You have to save the selected data in DB with some status lets say "BOOKED" when user selects a value).

3) Loop A first and inside it, Loop B.

4) Compare the value of A to match with B and status is booked.

5) Remove all the time values which has booked status.

6) Store the remaining values in a Page and source it to dropdown in UI to display the available slots.

Hope this helps!!.

Thanks,

Bala

Another option could be the following.

1. Assume doctor will take 10 min to consult each patient 

2. Split the slots accordingly. For example,10am, 10:10 am like this. Store them in DB or any local storage for convenience.

3. Let user select only the dates from calendar and  then populate the time slot as part of grid. Source the grid from the DB 

4. The slot, which is already been reserved, make them readonly/grey out .