Making classes "unavailable" once taken or scheduled

Complete noob here. Building a system to track a series of classes we’re teaching internally. Each employee is assigned to a learning track, which includes a specific series of classes/modules. I have the data linked to show which classes/modules are in each learning track, and which employees are in which learning track…but I’m trying to wrap my head around a way to “grey-out” or “hide” classes already taken by an employee (so they don’t accidentally get assigned to the same class twice). I’d be glad to share my work…although I suspect someone will just say “durp, do this”…

Thanks for ANY advice!!!

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