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The reason this configuration option is not present in the TS Model Factory tool is due to the fact that each group would most likely require a different model, so it wouldn't be ideal to make a specification like this for every group. Also, the underlying algorithm does check whether or not a differenced variable would be ideal. However, if you are certain that differencing your variable would make it stationary (for every group), you could try manually creating the differenced variable using a multi-row formula tool.