hi there,

I did not get exactly what you want to achieve by this.

However, i have simple approach to this - why cant you have a prompt list (in property we have prompt list in table type) and there you can have standard value as slot number  and prompt value as time. 

or

Alternatively, you can also have a data table with two property, time and slot. Have a data page where you can show in time and pick corresponding slot for processing.

Let me know if my understanding is not correct and i deviated from the main requirement?