Can I add additional appointment slots (at the same time) after publishing my form within the appointment slot widget?

I am using the appointment slot widget for an event. I wan to provide a time slot every half hour but in case this is not enough would like to offer a 2nd appointment option at the same time.

e.g.

Monday (Nov 28, 2016)  10:00-10:30
Monday (Nov 28, 2016)  10:30-11:00

would become

Monday (Nov 28, 2016)  10:00-10:30
Monday (Nov 28, 2016)  10:30-11:00{2}

Can I add this {2} after I published the form and there are already appointments set or would that make 3 appointments for that time slot?

Thank you very much.

To my understanding, you have previously added the options:

Monday (Nov 28, 2016)  10:00-10:30
Monday (Nov 28, 2016)  10:30-11:00

Then, from what I understand, you would like to have an additional appointment count for the option, 

Monday (Nov 28, 2016)  10:30-11:00

If the previous appointment available for that option (which is 1) was already set/taken and you want to add another appointment for that same time slot, then, you can add {2} after that option in the Appointment Slot widget wizard and update it.

Monday (Nov 28, 2016)  10:30-11:00{2}

This, however,  will only show 1 additional slot available when you load the form since the other one was already taken before it was updated.

Please note that you should not update anything in the option name,

Monday (Nov 28, 2016)  10:30-11:00

Otherwise, it will already be treated as a different option.

I hope this helps. If you need any further assistance, please feel free to contact us anytime. Thank you.