I think most people do them separately unless they are all the floors of a single building.
I must admit to not really knowing, since I only work on one map at a time. I keep all my symbols developments in one thread, and all my fills in another, but other than that I do my maps in separate threads.
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I must admit to not really knowing, since I only work on one map at a time. I keep all my symbols developments in one thread, and all my fills in another, but other than that I do my maps in separate threads.