When Automatic Iso Splitting option in Isometrics configuration is turned on, Isometrics will be splitted in to Sheets, but with no option or function to place a starting point from where IsoSheet order.
To verify the result, Create Iso via OPIM with Automatic Iso Splitting option turned on and check Iso-Sheet creation order, which is assigned by default. See image below.In below Steps you will find a detail instruction of how to acquire control of sheet creation order when Automatic Iso Splitting option is turned on.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/29194.component-autoplant-modeler
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