This is exactly the kind of problem that spreadsheets were built to solve, and also the kind that they were never designed to handle well. You have built a smart, functional reservation grid that blocks time slots based on party size and table capacity. That is real work, and it shows a clear understanding of how your restaurant operates during high-volume holiday hours. But you have also hit the wall that every ambitious spreadsheet builder eventually reaches: the moment when the tool that got you halfway cannot get you the rest of the way without becoming brittle, fragile, and hard to maintain.
Your current system works for visibility. It tells your team when a table is available and for how long. That is a genuine improvement over paper. But the missing piece, linking guest contact information, credit card details, and reservation references directly to the time blocks, is where traditional formulas start to break down. You are right that a second sheet interacting with the first is the logical next step. But the logic required to keep those two sheets synchronized, handle cancellations, prevent double bookings, and manage guest data securely is not a formula problem anymore. It is a data architecture problem.
What you have built is a prototype that proves the concept. The fact that you are doing this while learning Excel as you go is impressive, and it speaks to how intuitive the core idea is: match supply (table time) with demand (guest parties) as efficiently as possible. But prototypes are meant to reveal what a real solution should look like, not to be the final solution themselves. The next version of this system should not ask you to write nested OFFSET formulas and manual cross-sheet lookups. It should let you define the rules, party size limits, time increments, table capacity, and then handle the booking logic, guest data, and schedule visualization as a single, connected experience.
This is where AI-native tools change the equation. Instead of building workarounds for a spreadsheet's limitations, you can describe what you need in plain language and have the system generate the logic, the interface, and the data connections for you. Your reservation grid, guest database, and reference lookup can exist as one unified tool, not two sheets held together by formulas. You do not need to become a spreadsheet expert to manage holiday volume. You need a tool that understands your constraints and lets you focus on serving guests.
Your current approach is a smart start. Now take the next step and find a system that finishes what you started, without requiring you to write the rest of the code yourself.