I have seen on a few Incandescent lamps, especially in large stores or restaurants, a label on the etch that says "Group Replacement." What does this mean?

It mean lamps are replaced before they reach their end of life. It is the way to reduce the asociated cost - most expensive are not bulbs themselve, but the salary of the worker doing the replacement, while the biggest part are his preparation for the work (travel, needed equipment preparation, searching for box with new lamps and/or their orderring,...)
So when he does the replacement work, he at once, so the common preparation cost is paid only once for relamping interval for whole installation (and not for each failed bulb separatelly).
Second benefit is (when used high quality lamps, whose EOL is well predictable) there are all lamps in the installation always working properly.
Such group replacement is a good opportunity to get older, used, but still working bulbs, as they are waste...

I always wondered what Group Replacement meant. Now I know!