The Weld number is important for fabrication purposes in isometrics design therefore most users assign Weld IDs to the welds as per the project requirements.
How to use a WELD numbering system with prefixes such as X-001, X-002 or X-0NN in AutoPLANT Modeler’s isometrics generated via OpenPlant Isometrics Manager?The following steps illustrate how to assign Weld IDs with prefixes in the isometric generated through OpenPlant Isometrics Manager.
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12829.modifying-rectangular-enclosureboundary-in-open-plant-isometric-annotations
http://communities.bentley.com/products/plant/design___engineering/w/plant_design_and_engineering__wiki/12647.modifying-symbols
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