Best way to cross populate multiple arrays based on data entry into a single array?

My user is looking to have a schedule created using 4 seperate arrays. The goal is to fill in information into one or two arrays and have the main array autofill based on these entries. The schedule itself is of a large group of employees and three seperate groups of trainers. Each day, a trainee is scheduled with a trainer and for a specific time. Within the excel demo I've enclosed, I've included some more descriptions and a completed day on Saturday. I'd love to be able to accomplish this without macros but am open to any and all help. I don't know if it'd have to be a lookup or match or an if, then statement.

I tried finding something like it online but either nobody's ever thought of it, or they were smart enough to figure it out on their own. I'm not and I'm horrible at syntax, so again, any and all help is welcomed and greatly appreciated.

Schedule Demo.xlsx

Bueller Bump. . .

Getting kinda desperate here. Anyone know how this can be accomplished? I'm surprised I couldn't find anything covering this topic anywhere but I guess there's always a first. If I need to clarify anything, please let me know.

Thanks again *crosses fingers*

In the past, this forum has been a great source of help for me and I thank you all for that.

I'm not sure if; I didn't explain my issue well enough, nobody cares, nobody knows, or what.

Again, I really appreciate any help I can get, or guidance.