The best time to use celebrity

You can't reorganize them in any meaningful way, sadly, but it might make less difference than you think.

The levels of the bitizens on the floor are summed together, so it doesn't matter which slot is filled by who in this regard. The total level of all the bitizens gives you a percentage discount on the stock time for all items on the floor.

Thus, if your bitizen order is 9 in the first, 0 in the second, and 9 in the third, it is the same as having 9 in the first two and 0 in the third, or any other possible order of the bitizens.

For dream jobs, the first dream job worker on the floor will always double the stock of the first item, regardless of where they are actually "working" according to the status of the floor.

Thus, if your first bitizen is working their dream job, they'll double the first good. But if you only have one dream job worker on a floor and they're in the third slot, they'll still double the first good.

The formula for restock time appears to be as follows:

Time (minutes) = N * (1 - S/100) / 10

Where N is the base stock amount for the good in question (the amount of stock at Rank 1, i.e. no upgrades) and S is the sum of the appropriate skills of the bitizens in the store. I think fractions of a minute are dropped, but the minimum is 1 minute.

Therefore the difference in stocking times between two bitizens whose skill difference is 1 will be ~1% for all three positions in the level. Given that, it looks like a Dream Job worker is always preferable to a higher-skill non-Dream Job worker.