Hey @leonardoh481 
This kind of work, in bubble, can be tough. I have a plugin designed just for this that takes the struggle out! It allows for the creation of recurrences and filtered time slots easily! Think Calendly or the ability to set schedules for a shift and find the worker who is available during that time!
There’s not a lot of documentation yet, mostly in the forums but there are a few good examples and in always available for support via DM or the forum!