@alexcooney5 this seems to be 4 horizontal RGs (one per time slot)

Days of the week are defined as numbers: 0 (Sunday) to 6 (Saturday). Therefore in each RG you would have cell 1 = Sunday, cell 2 = Monday etc.
You could have a data type TimeSlot attached to User, along with workflows when checkbox is checked/unchecked to save the User’s availability to the DB

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