If I understand you correctly, then I don't think this setting has anything to do with that.
This would shrink you model in AutoCAD to 1/200th its size in ArchiCAD.
If a drawing unit is 1 meter in ArchiCAD you should set it to 1000 millimeters in the translator.
So if a 300 millimeter wall is 0.3 units in the Tracker in ArchiCAD, then your unit in ArchiCAD is 1 meter, and you should set it to 1000 millimeters in the translator.
If a 300 millimeter wall is 300 units in the Tracker in ArchiCAD, then your unit in ArchiCAD is 1 millimeter, and you should set it to 1 millimeter in the translator.
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