"stack" is the history option I prefer for most fields.
History tracking is useful because it allows you to show the user how Hero Lab reached the value it has for an attribute, or attack roll, or whatever. It isn't necessary, though, so you may also choose to work towards getting your system functional enough to build a character, and not worry about the "nice to have" things like history tracking, then come back and modify everything to use history tracking once you have your game more complete.
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